81550996 has 12 divisors (see below), whose sum is σ = 143432800. Its totient is φ = 40570200.

The previous prime is 81550991. The next prime is 81551003. The reversal of 81550996 is 69905518.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81550991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50430 + ... + 52021.

Almost surely, 2^81550996 is an apocalyptic number.

It is an amenable number.

81550996 is a deficient number, since it is larger than the sum of its proper divisors (61881804).

81550996 is a wasteful number, since it uses less digits than its factorization.

81550996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102654 (or 102652 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 81550996 is about 9030.5590081678. The cubic root of 81550996 is about 433.6537335881.

The spelling of 81550996 in words is "eighty-one million, five hundred fifty thousand, nine hundred ninety-six".