202690561 has 4 divisors (see below), whose sum is σ = 202829824. Its totient is φ = 202551300.

The previous prime is 202690549. The next prime is 202690567. The reversal of 202690561 is 165096202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 202690561 - 2⁹ = 202690049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202690567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67425 + ... + 70366.

It is an arithmetic number, because the mean of its divisors is an integer number (50707456).

Almost surely, 2^202690561 is an apocalyptic number.

It is an amenable number.

202690561 is a deficient number, since it is larger than the sum of its proper divisors (139263).

202690561 is a wasteful number, since it uses less digits than its factorization.

202690561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139262.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 202690561 is about 14236.9435273165. The cubic root of 202690561 is about 587.4142911636.

The spelling of 202690561 in words is "two hundred two million, six hundred ninety thousand, five hundred sixty-one".