30991038722 has 18 divisors (see below), whose sum is σ = 54079241283. Its totient is φ = 13281126852.

The previous prime is 30991038697. The next prime is 30991038731. The reversal of 30991038722 is 22783019903.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15495519361 + 15495519361 = 124481^2 + 124481^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=124481.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1733843 + ... + 1751625.

Almost surely, 2^30991038722 is an apocalyptic number.

30991038722 is a deficient number, since it is larger than the sum of its proper divisors (23088202561).

30991038722 is an frugal number, since it uses more digits than its factorization.

30991038722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35582 (or 17792 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 30991038722 in words is "thirty billion, nine hundred ninety-one million, thirty-eight thousand, seven hundred twenty-two".