102090261 has 64 divisors (see below), whose sum is σ = 178053120. Its totient is φ = 50561280.

The previous prime is 102090259. The next prime is 102090277. The reversal of 102090261 is 162090201.

It is not a de Polignac number, because 102090261 - 2¹ = 102090259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102090061) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 445695 + ... + 445923.

It is an arithmetic number, because the mean of its divisors is an integer number (2782080).

Almost surely, 2^102090261 is an apocalyptic number.

It is an amenable number.

102090261 is a deficient number, since it is larger than the sum of its proper divisors (75962859).

102090261 is a wasteful number, since it uses less digits than its factorization.

102090261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 102090261 is about 10103.9725355921. The cubic root of 102090261 is about 467.3706521580.

The spelling of 102090261 in words is "one hundred two million, ninety thousand, two hundred sixty-one".