81497100 has 36 divisors (see below), whose sum is σ = 235799144. Its totient is φ = 21732480.

The previous prime is 81497081. The next prime is 81497131. The reversal of 81497100 is 179418.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135529 + ... + 136128.

Almost surely, 2^81497100 is an apocalyptic number.

It is an amenable number.

81497100 is an abundant number, since it is smaller than the sum of its proper divisors (154302044).

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

81497100 is a wasteful number, since it uses less digits than its factorization.

81497100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271674 (or 271667 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 81497100 is about 9027.5744250601. The cubic root of 81497100 is about 433.5581804845.

The spelling of 81497100 in words is "eighty-one million, four hundred ninety-seven thousand, one hundred".