42158731 has 2 divisors, whose sum is σ = 42158732. Its totient is φ = 42158730.

The previous prime is 42158723. The next prime is 42158737. The reversal of 42158731 is 13785124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42158731 - 2³ = 42158723 is a prime.

It is a super-2 number, since 2×42158731² = 3554717199060722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42158693 and 42158702.

It is not a weakly prime, because it can be changed into another prime (42158737) 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 as a sum of consecutive naturals, namely, 21079365 + 21079366.

It is an arithmetic number, because the mean of its divisors is an integer number (21079366).

Almost surely, 2^42158731 is an apocalyptic number.

42158731 is a deficient number, since it is larger than the sum of its proper divisors (1).

42158731 is an equidigital number, since it uses as much as digits as its factorization.

42158731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 42158731 is about 6492.9755120438. The cubic root of 42158731 is about 348.0400133451.

The spelling of 42158731 in words is "forty-two million, one hundred fifty-eight thousand, seven hundred thirty-one".