261604022 has 4 divisors (see below), whose sum is σ = 392406036. Its totient is φ = 130802010.

The previous prime is 261604003. The next prime is 261604043. The reversal of 261604022 is 220406162.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65401004 + ... + 65401007.

It is an arithmetic number, because the mean of its divisors is an integer number (98101509).

Almost surely, 2^261604022 is an apocalyptic number.

261604022 is a deficient number, since it is larger than the sum of its proper divisors (130802014).

261604022 is a wasteful number, since it uses less digits than its factorization.

261604022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130802013.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 261604022 is about 16174.1776297900. The cubic root of 261604022 is about 639.5602627090.

The spelling of 261604022 in words is "two hundred sixty-one million, six hundred four thousand, twenty-two".