690071031 has 12 divisors (see below), whose sum is σ = 1073444008. Its totient is φ = 424659024.

The previous prime is 690071027. The next prime is 690071033. The reversal of 690071031 is 130170096.

It is not a de Polignac number, because 690071031 - 2² = 690071027 is a prime.

It is a super-2 number, since 2×690071031² = 952396055650805922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 690070986 and 690071004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690071033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2948905 + ... + 2949138.

Almost surely, 2^690071031 is an apocalyptic number.

690071031 is a deficient number, since it is larger than the sum of its proper divisors (383372977).

690071031 is a wasteful number, since it uses less digits than its factorization.

690071031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5898062 (or 5898059 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 690071031 is about 26269.2030903109. The cubic root of 690071031 is about 883.6859133933.

The spelling of 690071031 in words is "six hundred ninety million, seventy-one thousand, thirty-one".