1231690636 has 36 divisors (see below), whose sum is σ = 2429791560. Its totient is φ = 541780800.

The previous prime is 1231690633. The next prime is 1231690643. The reversal of 1231690636 is 6360961321.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1231690595 and 1231690604.

It is not an unprimeable number, because it can be changed into a prime (1231690633) 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, 27720 + ... + 56848.

It is an arithmetic number, because the mean of its divisors is an integer number (67494210).

Almost surely, 2^1231690636 is an apocalyptic number.

It is an amenable number.

1231690636 is a deficient number, since it is larger than the sum of its proper divisors (1198100924).

1231690636 is a wasteful number, since it uses less digits than its factorization.

1231690636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29206 (or 29173 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 1231690636 is about 35095.4503604100. The cubic root of 1231690636 is about 1071.9319439141.

The spelling of 1231690636 in words is "one billion, two hundred thirty-one million, six hundred ninety thousand, six hundred thirty-six".