42831731 has 4 divisors (see below), whose sum is σ = 42961464. Its totient is φ = 42702000.

The previous prime is 42831713. The next prime is 42831751. The reversal of 42831731 is 13713824.

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 42831731 - 2¹⁰ = 42830707 is a prime.

It is a super-2 number, since 2×42831731² = 3669114360912722, 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 = 42831694 and 42831703.

It is not an unprimeable number, because it can be changed into a prime (42831751) 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, 64370 + ... + 65031.

It is an arithmetic number, because the mean of its divisors is an integer number (10740366).

Almost surely, 2^42831731 is an apocalyptic number.

42831731 is a deficient number, since it is larger than the sum of its proper divisors (129733).

42831731 is a wasteful number, since it uses less digits than its factorization.

42831731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129732.

The product of its digits is 4032, while the sum is 29.

The square root of 42831731 is about 6544.5955566406. The cubic root of 42831731 is about 349.8822215954.

The spelling of 42831731 in words is "forty-two million, eight hundred thirty-one thousand, seven hundred thirty-one".