42615931 has 4 divisors (see below), whose sum is σ = 42646600. Its totient is φ = 42585264.

The previous prime is 42615929. The next prime is 42615961. The reversal of 42615931 is 13951624.

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 42615931 - 2¹ = 42615929 is a prime.

It is a super-2 number, since 2×42615931² = 3632235149993522, 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 = 42615893 and 42615902.

It is not an unprimeable number, because it can be changed into a prime (42615961) 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, 13146 + ... + 16063.

It is an arithmetic number, because the mean of its divisors is an integer number (10661650).

Almost surely, 2^42615931 is an apocalyptic number.

42615931 is a deficient number, since it is larger than the sum of its proper divisors (30669).

42615931 is a wasteful number, since it uses less digits than its factorization.

42615931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30668.

The product of its digits is 6480, while the sum is 31.

The square root of 42615931 is about 6528.0878517373. The cubic root of 42615931 is about 349.2936256859.

The spelling of 42615931 in words is "forty-two million, six hundred fifteen thousand, nine hundred thirty-one".