261422556 has 24 divisors (see below), whose sum is σ = 610331904. Its totient is φ = 87091440.

The previous prime is 261422521. The next prime is 261422573. The reversal of 261422556 is 655224162.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20461 + ... + 30683.

It is an arithmetic number, because the mean of its divisors is an integer number (25430496).

Almost surely, 2^261422556 is an apocalyptic number.

It is an amenable number.

261422556 is an abundant number, since it is smaller than the sum of its proper divisors (348909348).

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

261422556 is a wasteful number, since it uses less digits than its factorization.

261422556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12361 (or 12359 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 261422556 is about 16168.5669123766. The cubic root of 261422556 is about 639.4123479491.

The spelling of 261422556 in words is "two hundred sixty-one million, four hundred twenty-two thousand, five hundred fifty-six".