30977891837 has 4 divisors (see below), whose sum is σ = 30978270876. Its totient is φ = 30977512800.

The previous prime is 30977891831. The next prime is 30977891851. The reversal of 30977891837 is 73819877903.

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 2 ways, for example, as 13067690596 + 17910201241 = 114314^2 + 133829^2 .

It is a cyclic number.

It is not a de Polignac number, because 30977891837 - 2¹⁰ = 30977890813 is a prime.

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 30977891837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30977891831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10664 + ... + 249137.

It is an arithmetic number, because the mean of its divisors is an integer number (7744567719).

Almost surely, 2^30977891837 is an apocalyptic number.

It is an amenable number.

30977891837 is a deficient number, since it is larger than the sum of its proper divisors (379039).

30977891837 is a wasteful number, since it uses less digits than its factorization.

30977891837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379038.

The product of its (nonzero) digits is 16003008, while the sum is 62.

The spelling of 30977891837 in words is "thirty billion, nine hundred seventy-seven million, eight hundred ninety-one thousand, eight hundred thirty-seven".