31690669 has 8 divisors (see below), whose sum is σ = 33888888. Its totient is φ = 29529600.

The previous prime is 31690639. The next prime is 31690679. The reversal of 31690669 is 96609613.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21206025 + 10484644 = 4605^2 + 3238^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31690669 - 2¹¹ = 31688621 is a prime.

It is a super-2 number, since 2×31690669² = 2008597003335122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31690609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7512 + ... + 10945.

It is an arithmetic number, because the mean of its divisors is an integer number (4236111).

Almost surely, 2^31690669 is an apocalyptic number.

It is an amenable number.

31690669 is a deficient number, since it is larger than the sum of its proper divisors (2198219).

31690669 is a wasteful number, since it uses less digits than its factorization.

31690669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18575.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 31690669 is about 5629.4465980236. The cubic root of 31690669 is about 316.4539122471.

The spelling of 31690669 in words is "thirty-one million, six hundred ninety thousand, six hundred sixty-nine".