689064631 has 2 divisors, whose sum is σ = 689064632. Its totient is φ = 689064630.

The previous prime is 689064581. The next prime is 689064641. The reversal of 689064631 is 136460986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689064631 - 2⁷ = 689064503 is a prime.

It is a super-2 number, since 2×689064631² = 949620131390332322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689064641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344532315 + 344532316.

It is an arithmetic number, because the mean of its divisors is an integer number (344532316).

Almost surely, 2^689064631 is an apocalyptic number.

689064631 is a deficient number, since it is larger than the sum of its proper divisors (1).

689064631 is an equidigital number, since it uses as much as digits as its factorization.

689064631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 689064631 is about 26250.0405904448. The cubic root of 689064631 is about 883.2561150332.

It can be divided in two parts, 68906 and 4631, that added together give a palindrome (73537).

The spelling of 689064631 in words is "six hundred eighty-nine million, sixty-four thousand, six hundred thirty-one".