565540831 has 2 divisors, whose sum is σ = 565540832. Its totient is φ = 565540830.

The previous prime is 565540817. The next prime is 565540841. The reversal of 565540831 is 138045565.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 565540831 - 2¹¹ = 565538783 is a prime.

It is a super-2 number, since 2×565540831² = 639672863056341122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (565540841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282770415 + 282770416.

It is an arithmetic number, because the mean of its divisors is an integer number (282770416).

Almost surely, 2^565540831 is an apocalyptic number.

565540831 is a deficient number, since it is larger than the sum of its proper divisors (1).

565540831 is an equidigital number, since it uses as much as digits as its factorization.

565540831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 565540831 is about 23781.1023924460. The cubic root of 565540831 is about 826.9666365165.

It can be divided in two parts, 5655 and 40831, that multiplied together give a triangular number (230899305 = T₂₁₄₈₉).

The spelling of 565540831 in words is "five hundred sixty-five million, five hundred forty thousand, eight hundred thirty-one".