261310554 has 24 divisors (see below), whose sum is σ = 567993972. Its totient is φ = 86823360.

The previous prime is 261310549. The next prime is 261310571. The reversal of 261310554 is 455013162.

261310554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 242518329 + 18792225 = 15573^2 + 4335^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17557 + ... + 28824.

Almost surely, 2^261310554 is an apocalyptic number.

261310554 is an abundant number, since it is smaller than the sum of its proper divisors (306683418).

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

261310554 is a wasteful number, since it uses less digits than its factorization.

261310554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46702 (or 46699 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 261310554 is about 16165.1029690503. The cubic root of 261310554 is about 639.3210198291.

The spelling of 261310554 in words is "two hundred sixty-one million, three hundred ten thousand, five hundred fifty-four".