102097581 has 16 divisors (see below), whose sum is σ = 139316544. Its totient is φ = 66489984.

The previous prime is 102097577. The next prime is 102097607. The reversal of 102097581 is 185790201.

It is not a de Polignac number, because 102097581 - 2² = 102097577 is a prime.

It is a super-2 number, since 2×102097581² = 20847832092103122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102097511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21255 + ... + 25611.

It is an arithmetic number, because the mean of its divisors is an integer number (8707284).

Almost surely, 2^102097581 is an apocalyptic number.

It is an amenable number.

102097581 is a deficient number, since it is larger than the sum of its proper divisors (37218963).

102097581 is a wasteful number, since it uses less digits than its factorization.

102097581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4540.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 102097581 is about 10104.3347628629. The cubic root of 102097581 is about 467.3818222454.

The spelling of 102097581 in words is "one hundred two million, ninety-seven thousand, five hundred eighty-one".