261120045 has 16 divisors (see below), whose sum is σ = 420456960. Its totient is φ = 138375744.

The previous prime is 261120019. The next prime is 261120053. The reversal of 261120045 is 540021162.

It is not a de Polignac number, because 261120045 - 2⁶ = 261119981 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53085 + ... + 57794.

It is an arithmetic number, because the mean of its divisors is an integer number (26278560).

Almost surely, 2^261120045 is an apocalyptic number.

It is an amenable number.

261120045 is a deficient number, since it is larger than the sum of its proper divisors (159336915).

261120045 is a wasteful number, since it uses less digits than its factorization.

261120045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111044.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 261120045 is about 16159.2092937742. The cubic root of 261120045 is about 639.1656159531.

The spelling of 261120045 in words is "two hundred sixty-one million, one hundred twenty thousand, forty-five".