42757031 has 4 divisors (see below), whose sum is σ = 42853992. Its totient is φ = 42660072.

The previous prime is 42757021. The next prime is 42757063. The reversal of 42757031 is 13075724.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42757031 is a prime.

It is a super-2 number, since 2×42757031² = 3656327399869922, 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 = 42756985 and 42757003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42757021) 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, 47816 + ... + 48701.

It is an arithmetic number, because the mean of its divisors is an integer number (10713498).

Almost surely, 2^42757031 is an apocalyptic number.

42757031 is a deficient number, since it is larger than the sum of its proper divisors (96961).

42757031 is an equidigital number, since it uses as much as digits as its factorization.

42757031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96960.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 42757031 is about 6538.8860672136. The cubic root of 42757031 is about 349.6787010572.

The spelling of 42757031 in words is "forty-two million, seven hundred fifty-seven thousand, thirty-one".