30490900381 has 4 divisors (see below), whose sum is σ = 30492750172. Its totient is φ = 30489050592.

The previous prime is 30490900343. The next prime is 30490900399. The reversal of 30490900381 is 18300909403.

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 4999904100 + 25490996281 = 70710^2 + 159659^2 .

It is a cyclic number.

It is not a de Polignac number, because 30490900381 - 2⁹ = 30490899869 is a prime.

It is a super-2 number, since 2×30490900381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30490900381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30490903381) 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, 899946 + ... + 933211.

It is an arithmetic number, because the mean of its divisors is an integer number (7623187543).

Almost surely, 2^30490900381 is an apocalyptic number.

It is an amenable number.

30490900381 is a deficient number, since it is larger than the sum of its proper divisors (1849791).

30490900381 is a wasteful number, since it uses less digits than its factorization.

30490900381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849790.

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 30490900381 in words is "thirty billion, four hundred ninety million, nine hundred thousand, three hundred eighty-one".