813156244 has 6 divisors (see below), whose sum is σ = 1423023434. Its totient is φ = 406578120.

The previous prime is 813156217. The next prime is 813156269. The reversal of 813156244 is 442651318.

It can be written as a sum of positive squares in only one way, i.e., 697593744 + 115562500 = 26412^2 + 10750^2 .

It is a super-2 number, since 2×813156244² = 1322446154312375072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101644527 + ... + 101644534.

Almost surely, 2^813156244 is an apocalyptic number.

It is an amenable number.

813156244 is a deficient number, since it is larger than the sum of its proper divisors (609867190).

813156244 is a wasteful number, since it uses less digits than its factorization.

813156244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203289065 (or 203289063 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 813156244 is about 28515.8945853010. The cubic root of 813156244 is about 933.3789460135.

The spelling of 813156244 in words is "eight hundred thirteen million, one hundred fifty-six thousand, two hundred forty-four".