30001357681 has 3 divisors (see below), whose sum is σ = 30001530891. Its totient is φ = 30001184472.

The previous prime is 30001357649. The next prime is 30001357693. The reversal of 30001357681 is 18675310003.

The square root of 30001357681 is 173209.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 637108081 + 29364249600 = 25241^2 + 171360^2 .

It is not a de Polignac number, because 30001357681 - 2⁵ = 30001357649 is a prime.

It is a super-2 number, since 2×30001357681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30001357621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 86605 + ... + 259813.

It is an arithmetic number, because the mean of its divisors is an integer number (10000510297).

Almost surely, 2^30001357681 is an apocalyptic number.

30001357681 is the 173209-th square number.

30001357681 is the 86605-th centered octagonal number.

It is an amenable number.

30001357681 is a deficient number, since it is larger than the sum of its proper divisors (173210).

30001357681 is an frugal number, since it uses more digits than its factorization.

30001357681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346418 (or 173209 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

Adding to 30001357681 its reverse (18675310003), we get a palindrome (48676667684).

The spelling of 30001357681 in words is "thirty billion, one million, three hundred fifty-seven thousand, six hundred eighty-one".