122156431 has 4 divisors (see below), whose sum is σ = 124755552. Its totient is φ = 119557312.

The previous prime is 122156413. The next prime is 122156449. The reversal of 122156431 is 134651221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134651221 = 2239 ⋅60139.

It is an interprime number because it is at equal distance from previous prime (122156413) and next prime (122156449).

It is a cyclic number.

It is not a de Polignac number, because 122156431 - 2⁷ = 122156303 is a prime.

It is a super-2 number, since 2×122156431² = 29844387269315522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122156396 and 122156405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122106431) 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, 1299490 + ... + 1299583.

It is an arithmetic number, because the mean of its divisors is an integer number (31188888).

Almost surely, 2^122156431 is an apocalyptic number.

122156431 is a deficient number, since it is larger than the sum of its proper divisors (2599121).

122156431 is an equidigital number, since it uses as much as digits as its factorization.

122156431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599120.

The product of its digits is 1440, while the sum is 25.

The square root of 122156431 is about 11052.4400473380. The cubic root of 122156431 is about 496.1794559081.

The spelling of 122156431 in words is "one hundred twenty-two million, one hundred fifty-six thousand, four hundred thirty-one".