690312589 has 4 divisors (see below), whose sum is σ = 708969724. Its totient is φ = 671655456.

The previous prime is 690312563. The next prime is 690312599. The reversal of 690312589 is 985213096.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 661775625 + 28536964 = 25725^2 + 5342^2 .

It is a cyclic number.

It is not a de Polignac number, because 690312589 - 2¹¹ = 690310541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690312509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9328512 + ... + 9328585.

It is an arithmetic number, because the mean of its divisors is an integer number (177242431).

Almost surely, 2^690312589 is an apocalyptic number.

It is an amenable number.

690312589 is a deficient number, since it is larger than the sum of its proper divisors (18657135).

690312589 is a wasteful number, since it uses less digits than its factorization.

690312589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18657134.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 690312589 is about 26273.8004293250. The cubic root of 690312589 is about 883.7890122000.

The spelling of 690312589 in words is "six hundred ninety million, three hundred twelve thousand, five hundred eighty-nine".