815491112 has 8 divisors (see below), whose sum is σ = 1529045850. Its totient is φ = 407745552.

The previous prime is 815491111. The next prime is 815491123. The reversal of 815491112 is 211194518.

It can be written as a sum of positive squares in only one way, i.e., 700872676 + 114618436 = 26474^2 + 10706^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (815491111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50968187 + ... + 50968202.

Almost surely, 2^815491112 is an apocalyptic number.

It is an amenable number.

815491112 is a deficient number, since it is larger than the sum of its proper divisors (713554738).

815491112 is a wasteful number, since it uses less digits than its factorization.

815491112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101936395 (or 101936391 counting only the distinct ones).

The product of its digits is 2880, while the sum is 32.

The square root of 815491112 is about 28556.8050033613. The cubic root of 815491112 is about 934.2714493912.

It can be divided in two parts, 8 and 15491112, that multiplied together give a triangular number (123928896 = T₁₅₇₄₃).

The spelling of 815491112 in words is "eight hundred fifteen million, four hundred ninety-one thousand, one hundred twelve".