42208931 has 2 divisors, whose sum is σ = 42208932. Its totient is φ = 42208930.

The previous prime is 42208927. The next prime is 42208951. The reversal of 42208931 is 13980224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42208931 - 2² = 42208927 is a prime.

It is a super-2 number, since 2×42208931² = 3563187712325522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42208894 and 42208903.

It is not a weakly prime, because it can be changed into another prime (42208921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21104465 + 21104466.

It is an arithmetic number, because the mean of its divisors is an integer number (21104466).

Almost surely, 2^42208931 is an apocalyptic number.

42208931 is a deficient number, since it is larger than the sum of its proper divisors (1).

42208931 is an equidigital number, since it uses as much as digits as its factorization.

42208931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 42208931 is about 6496.8400780687. The cubic root of 42208931 is about 348.1781000327.

The spelling of 42208931 in words is "forty-two million, two hundred eight thousand, nine hundred thirty-one".