30891020697 has 12 divisors (see below), whose sum is σ = 44627508900. Its totient is φ = 20590715808.

The previous prime is 30891020663. The next prime is 30891020717. The reversal of 30891020697 is 79602019803.

It can be written as a sum of positive squares in 2 ways, for example, as 14391361296 + 16499659401 = 119964^2 + 128451^2 .

It is not a de Polignac number, because 30891020697 - 2⁸ = 30891020441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30891022697) 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 11 ways as a sum of consecutive naturals, for example, 214822 + ... + 328527.

It is an arithmetic number, because the mean of its divisors is an integer number (3718959075).

Almost surely, 2^30891020697 is an apocalyptic number.

It is an amenable number.

30891020697 is a deficient number, since it is larger than the sum of its proper divisors (13736488203).

30891020697 is a wasteful number, since it uses less digits than its factorization.

30891020697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549672 (or 549669 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 30891020697 in words is "thirty billion, eight hundred ninety-one million, twenty thousand, six hundred ninety-seven".