31426731 has 32 divisors (see below), whose sum is σ = 53498880. Its totient is φ = 17860608.

The previous prime is 31426729. The next prime is 31426751. The reversal of 31426731 is 13762413.

It is not a de Polignac number, because 31426731 - 2¹ = 31426729 is a prime.

It is a super-2 number, since 2×31426731² = 1975278842692722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31426695 and 31426704.

It is not an unprimeable number, because it can be changed into a prime (31426751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48250 + ... + 48896.

It is an arithmetic number, because the mean of its divisors is an integer number (1671840).

Almost surely, 2^31426731 is an apocalyptic number.

31426731 is a deficient number, since it is larger than the sum of its proper divisors (22072149).

31426731 is a wasteful number, since it uses less digits than its factorization.

31426731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920 (or 914 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 31426731 is about 5605.9549587916. The cubic root of 31426731 is about 315.5729255787.

The spelling of 31426731 in words is "thirty-one million, four hundred twenty-six thousand, seven hundred thirty-one".