30751923997 has 4 divisors (see below), whose sum is σ = 31583057116. Its totient is φ = 29920790880.

The previous prime is 30751923991. The next prime is 30751924001. The reversal of 30751923997 is 79932915703.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79932915703 = 23 ⋅3475344161.

It can be written as a sum of positive squares in 2 ways, for example, as 18726827716 + 12025096281 = 136846^2 + 109659^2 .

It is a cyclic number.

It is not a de Polignac number, because 30751923997 - 2⁷ = 30751923869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30751923991) 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, 415566504 + ... + 415566577.

It is an arithmetic number, because the mean of its divisors is an integer number (7895764279).

Almost surely, 2^30751923997 is an apocalyptic number.

30751923997 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

30751923997 is a deficient number, since it is larger than the sum of its proper divisors (831133119).

30751923997 is an equidigital number, since it uses as much as digits as its factorization.

30751923997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831133118.

The product of its (nonzero) digits is 3214890, while the sum is 55.

The spelling of 30751923997 in words is "thirty billion, seven hundred fifty-one million, nine hundred twenty-three thousand, nine hundred ninety-seven".