81163502 has 12 divisors (see below), whose sum is σ = 141622200. Its totient is φ = 34784316.

The previous prime is 81163483. The next prime is 81163513. The reversal of 81163502 is 20536118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 414002 + ... + 414197.

It is an arithmetic number, because the mean of its divisors is an integer number (11801850).

Almost surely, 2^81163502 is an apocalyptic number.

81163502 is a deficient number, since it is larger than the sum of its proper divisors (60458698).

81163502 is a wasteful number, since it uses less digits than its factorization.

81163502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828215 (or 828208 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 81163502 is about 9009.0788652337. The cubic root of 81163502 is about 432.9657997370.

The spelling of 81163502 in words is "eighty-one million, one hundred sixty-three thousand, five hundred two".