81151600 has 30 divisors (see below), whose sum is σ = 194967680. Its totient is φ = 32460480.

The previous prime is 81151579. The next prime is 81151627. The reversal of 81151600 is 615118.

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, 101040 + ... + 101839.

Almost surely, 2^81151600 is an apocalyptic number.

81151600 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81151600 is an abundant number, since it is smaller than the sum of its proper divisors (113816080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81151600 is a wasteful number, since it uses less digits than its factorization.

81151600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202897 (or 202886 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 81151600 is about 9008.4182851375. The cubic root of 81151600 is about 432.9446350068.

Adding to 81151600 its reverse (615118), we get a palindrome (81766718).

The spelling of 81151600 in words is "eighty-one million, one hundred fifty-one thousand, six hundred".