122991031 has 4 divisors (see below), whose sum is σ = 123158200. Its totient is φ = 122823864.

The previous prime is 122991017. The next prime is 122991061. The reversal of 122991031 is 130199221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 122991031 - 2⁵ = 122990999 is a prime.

It is a super-2 number, since 2×122991031² = 30253587412885922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122991061) 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, 82476 + ... + 83953.

It is an arithmetic number, because the mean of its divisors is an integer number (30789550).

Almost surely, 2^122991031 is an apocalyptic number.

122991031 is a deficient number, since it is larger than the sum of its proper divisors (167169).

122991031 is an equidigital number, since it uses as much as digits as its factorization.

122991031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167168.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 122991031 is about 11090.1321452902. The cubic root of 122991031 is about 497.3068950819.

The spelling of 122991031 in words is "one hundred twenty-two million, nine hundred ninety-one thousand, thirty-one".