811493236 has 6 divisors (see below), whose sum is σ = 1420113170. Its totient is φ = 405746616.

The previous prime is 811493227. The next prime is 811493239. The reversal of 811493236 is 632394118.

It can be written as a sum of positive squares in only one way, i.e., 647397136 + 164096100 = 25444^2 + 12810^2 .

It is a junction number, because it is equal to n+sod(n) for n = 811493195 and 811493204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811493239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101436651 + ... + 101436658.

Almost surely, 2^811493236 is an apocalyptic number.

It is an amenable number.

811493236 is a deficient number, since it is larger than the sum of its proper divisors (608619934).

811493236 is a wasteful number, since it uses less digits than its factorization.

811493236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202873313 (or 202873311 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 811493236 is about 28486.7203447501. The cubic root of 811493236 is about 932.7422188450.

The spelling of 811493236 in words is "eight hundred eleven million, four hundred ninety-three thousand, two hundred thirty-six".