42910831 has 2 divisors, whose sum is σ = 42910832. Its totient is φ = 42910830.

The previous prime is 42910823. The next prime is 42910837. The reversal of 42910831 is 13801924.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42910831 - 2³ = 42910823 is a prime.

It is a super-2 number, since 2×42910831² = 3682678834221122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42910831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42910837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21455415 + 21455416.

It is an arithmetic number, because the mean of its divisors is an integer number (21455416).

Almost surely, 2^42910831 is an apocalyptic number.

42910831 is a deficient number, since it is larger than the sum of its proper divisors (1).

42910831 is an equidigital number, since it uses as much as digits as its factorization.

42910831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 42910831 is about 6550.6359233284. The cubic root of 42910831 is about 350.0974721720.

The spelling of 42910831 in words is "forty-two million, nine hundred ten thousand, eight hundred thirty-one".