30791821145 has 4 divisors (see below), whose sum is σ = 36950185380. Its totient is φ = 24633456912.

The previous prime is 30791821141. The next prime is 30791821153. The reversal of 30791821145 is 54112819703.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20365573264 + 10426247881 = 142708^2 + 102109^2 .

It is a cyclic number.

It is not a de Polignac number, because 30791821145 - 2² = 30791821141 is a prime.

It is a super-2 number, since 2×30791821145² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30791821141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3079182110 + ... + 3079182119.

It is an arithmetic number, because the mean of its divisors is an integer number (9237546345).

Almost surely, 2^30791821145 is an apocalyptic number.

It is an amenable number.

30791821145 is a deficient number, since it is larger than the sum of its proper divisors (6158364235).

30791821145 is an equidigital number, since it uses as much as digits as its factorization.

30791821145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6158364234.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 30791821145 in words is "thirty billion, seven hundred ninety-one million, eight hundred twenty-one thousand, one hundred forty-five".