261055256 has 32 divisors (see below), whose sum is σ = 610260480. Its totient is φ = 101709600.

The previous prime is 261055237. The next prime is 261055259. The reversal of 261055256 is 652550162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261055259) 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, 211280 + ... + 212511.

It is an arithmetic number, because the mean of its divisors is an integer number (19070640).

Almost surely, 2^261055256 is an apocalyptic number.

It is an amenable number.

261055256 is an abundant number, since it is smaller than the sum of its proper divisors (349205224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261055256 is a wasteful number, since it uses less digits than its factorization.

261055256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423815 (or 423811 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 261055256 is about 16157.2044611684. The cubic root of 261055256 is about 639.1127484089.

The spelling of 261055256 in words is "two hundred sixty-one million, fifty-five thousand, two hundred fifty-six".