261272274 has 32 divisors (see below), whose sum is σ = 529612800. Its totient is φ = 85920912.

The previous prime is 261272251. The next prime is 261272293. The reversal of 261272274 is 472272162.

It is a happy number.

It is a super-2 number, since 2×261272274² = 136526402322262152, which contains 22 as substring.

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, 150777 + ... + 152499.

It is an arithmetic number, because the mean of its divisors is an integer number (16550400).

Almost surely, 2^261272274 is an apocalyptic number.

261272274 is an abundant number, since it is smaller than the sum of its proper divisors (268340526).

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

261272274 is a wasteful number, since it uses less digits than its factorization.

261272274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054.

The product of its digits is 18816, while the sum is 33.

The square root of 261272274 is about 16163.9188936347. The cubic root of 261272274 is about 639.2897997560.

The spelling of 261272274 in words is "two hundred sixty-one million, two hundred seventy-two thousand, two hundred seventy-four".