690000631 has 4 divisors (see below), whose sum is σ = 690307000. Its totient is φ = 689694264.

The previous prime is 690000617. The next prime is 690000659. The reversal of 690000631 is 136000096.

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

It is a cyclic number.

It is not a de Polignac number, because 690000631 - 2¹¹ = 689998583 is a prime.

It is a super-2 number, since 2×690000631² = 952201741560796322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690000596 and 690000605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690000601) 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, 149781 + ... + 154318.

It is an arithmetic number, because the mean of its divisors is an integer number (172576750).

Almost surely, 2^690000631 is an apocalyptic number.

690000631 is a deficient number, since it is larger than the sum of its proper divisors (306369).

690000631 is a wasteful number, since it uses less digits than its factorization.

690000631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306368.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 690000631 is about 26267.8630840044. The cubic root of 690000631 is about 883.6558616058.

The spelling of 690000631 in words is "six hundred ninety million, six hundred thirty-one", and thus it is an aban number.