42513931 has 4 divisors (see below), whose sum is σ = 42572200. Its totient is φ = 42455664.

The previous prime is 42513917. The next prime is 42513941. The reversal of 42513931 is 13931524.

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 42513931 - 2¹⁵ = 42481163 is a prime.

It is a super-2 number, since 2×42513931² = 3614868658145522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42513931.

It is not an unprimeable number, because it can be changed into a prime (42513901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28026 + ... + 29503.

It is an arithmetic number, because the mean of its divisors is an integer number (10643050).

Almost surely, 2^42513931 is an apocalyptic number.

42513931 is a deficient number, since it is larger than the sum of its proper divisors (58269).

42513931 is an equidigital number, since it uses as much as digits as its factorization.

42513931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58268.

The product of its digits is 3240, while the sum is 28.

The square root of 42513931 is about 6520.2707765859. The cubic root of 42513931 is about 349.0147283215.

The spelling of 42513931 in words is "forty-two million, five hundred thirteen thousand, nine hundred thirty-one".