261037055 has 4 divisors (see below), whose sum is σ = 313244472. Its totient is φ = 208829640.

The previous prime is 261037043. The next prime is 261037069. The reversal of 261037055 is 550730162.

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

It is not a de Polignac number, because 261037055 - 2⁴ = 261037039 is a prime.

It is a Duffinian number.

It is a congruent 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, 26103701 + ... + 26103710.

It is an arithmetic number, because the mean of its divisors is an integer number (78311118).

Almost surely, 2^261037055 is an apocalyptic number.

261037055 is a deficient number, since it is larger than the sum of its proper divisors (52207417).

261037055 is an equidigital number, since it uses as much as digits as its factorization.

261037055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52207416.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 261037055 is about 16156.6412041612. The cubic root of 261037055 is about 639.0978948978.

The spelling of 261037055 in words is "two hundred sixty-one million, thirty-seven thousand, fifty-five".