102090591 has 32 divisors (see below), whose sum is σ = 161952000. Its totient is φ = 63366624.

The previous prime is 102090589. The next prime is 102090617. The reversal of 102090591 is 195090201.

It is a happy number.

It is not a de Polignac number, because 102090591 - 2¹ = 102090589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102050591) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28581 + ... + 31953.

It is an arithmetic number, because the mean of its divisors is an integer number (5061000).

Almost surely, 2^102090591 is an apocalyptic number.

102090591 is a deficient number, since it is larger than the sum of its proper divisors (59861409).

102090591 is a wasteful number, since it uses less digits than its factorization.

102090591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460 (or 3454 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 102090591 is about 10103.9888657896. The cubic root of 102090591 is about 467.3711557390.

The spelling of 102090591 in words is "one hundred two million, ninety thousand, five hundred ninety-one".