842072531 has 2 divisors, whose sum is σ = 842072532. Its totient is φ = 842072530.

The previous prime is 842072471. The next prime is 842072537. The reversal of 842072531 is 135270248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 842072531 - 2⁶ = 842072467 is a prime.

It is a super-2 number, since 2×842072531² = 1418172294929491922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (842072537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421036265 + 421036266.

It is an arithmetic number, because the mean of its divisors is an integer number (421036266).

Almost surely, 2^842072531 is an apocalyptic number.

842072531 is a deficient number, since it is larger than the sum of its proper divisors (1).

842072531 is an equidigital number, since it uses as much as digits as its factorization.

842072531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 842072531 is about 29018.4860218448. The cubic root of 842072531 is about 944.3141561136.

The spelling of 842072531 in words is "eight hundred forty-two million, seventy-two thousand, five hundred thirty-one".