42757531 has 2 divisors, whose sum is σ = 42757532. Its totient is φ = 42757530.

The previous prime is 42757489. The next prime is 42757553. The reversal of 42757531 is 13575724.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42757531 - 2¹⁵ = 42724763 is a prime.

It is a super-2 number, since 2×42757531² = 3656412914431922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42757331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21378765 + 21378766.

It is an arithmetic number, because the mean of its divisors is an integer number (21378766).

Almost surely, 2^42757531 is an apocalyptic number.

42757531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42757531 is an equidigital number, since it uses as much as digits as its factorization.

42757531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29400, while the sum is 34.

The square root of 42757531 is about 6538.9242999136. The cubic root of 42757531 is about 349.6800640975.

The spelling of 42757531 in words is "forty-two million, seven hundred fifty-seven thousand, five hundred thirty-one".