261504879 has 8 divisors (see below), whose sum is σ = 348882432. Its totient is φ = 174231960.

The previous prime is 261504869. The next prime is 261504889. The reversal of 261504879 is 978405162.

It is an interprime number because it is at equal distance from previous prime (261504869) and next prime (261504889).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261504879 - 2⁷ = 261504751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261504879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261504839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20127 + ... + 30464.

It is an arithmetic number, because the mean of its divisors is an integer number (43610304).

Almost surely, 2^261504879 is an apocalyptic number.

261504879 is a deficient number, since it is larger than the sum of its proper divisors (87377553).

261504879 is a wasteful number, since it uses less digits than its factorization.

261504879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52317.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 261504879 is about 16171.1124849220. The cubic root of 261504879 is about 639.4794587335.

The spelling of 261504879 in words is "two hundred sixty-one million, five hundred four thousand, eight hundred seventy-nine".