261744955 has 4 divisors (see below), whose sum is σ = 314093952. Its totient is φ = 209395960.

The previous prime is 261744949. The next prime is 261744983. The reversal of 261744955 is 559447162.

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

It is not a de Polignac number, because 261744955 - 2⁹ = 261744443 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26174491 + ... + 26174500.

It is an arithmetic number, because the mean of its divisors is an integer number (78523488).

Almost surely, 2^261744955 is an apocalyptic number.

261744955 is a deficient number, since it is larger than the sum of its proper divisors (52348997).

261744955 is an equidigital number, since it uses as much as digits as its factorization.

261744955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52348996.

The product of its digits is 302400, while the sum is 43.

The square root of 261744955 is about 16178.5337716370. The cubic root of 261744955 is about 639.6750914294.

The spelling of 261744955 in words is "two hundred sixty-one million, seven hundred forty-four thousand, nine hundred fifty-five".