685563031 has 2 divisors, whose sum is σ = 685563032. Its totient is φ = 685563030.

The previous prime is 685562993. The next prime is 685563037. The reversal of 685563031 is 130365586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685563031 - 2²¹ = 683465879 is a prime.

It is a super-2 number, since 2×685563031² = 939993338947813922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685563037) 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, 342781515 + 342781516.

It is an arithmetic number, because the mean of its divisors is an integer number (342781516).

Almost surely, 2^685563031 is an apocalyptic number.

685563031 is a deficient number, since it is larger than the sum of its proper divisors (1).

685563031 is an equidigital number, since it uses as much as digits as its factorization.

685563031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 685563031 is about 26183.2586016332. The cubic root of 685563031 is about 881.7574344575.

The spelling of 685563031 in words is "six hundred eighty-five million, five hundred sixty-three thousand, thirty-one".