685234531 has 2 divisors, whose sum is σ = 685234532. Its totient is φ = 685234530.

The previous prime is 685234523. The next prime is 685234547. The reversal of 685234531 is 135432586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685234531 - 2³ = 685234523 is a prime.

It is a super-2 number, since 2×685234531² = 939092724949579922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (685234631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342617265 + 342617266.

It is an arithmetic number, because the mean of its divisors is an integer number (342617266).

Almost surely, 2^685234531 is an apocalyptic number.

685234531 is a deficient number, since it is larger than the sum of its proper divisors (1).

685234531 is an equidigital number, since it uses as much as digits as its factorization.

685234531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 37.

The square root of 685234531 is about 26176.9847576072. The cubic root of 685234531 is about 881.6165752507.

The spelling of 685234531 in words is "six hundred eighty-five million, two hundred thirty-four thousand, five hundred thirty-one".