261322254 has 32 divisors (see below), whose sum is σ = 581264640. Its totient is φ = 87025176.

The previous prime is 261322207. The next prime is 261322267. The reversal of 261322254 is 452223162.

It is a happy number.

261322254 is a `hidden beast` number, since 2 + 613 + 22 + 25 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 88567 + ... + 91469.

It is an arithmetic number, because the mean of its divisors is an integer number (18164520).

Almost surely, 2^261322254 is an apocalyptic number.

261322254 is an abundant number, since it is smaller than the sum of its proper divisors (319942386).

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

261322254 is a wasteful number, since it uses less digits than its factorization.

261322254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4581 (or 4575 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 261322254 is about 16165.4648556730. The cubic root of 261322254 is about 639.3305614061.

The spelling of 261322254 in words is "two hundred sixty-one million, three hundred twenty-two thousand, two hundred fifty-four".