261310562 has 8 divisors (see below), whose sum is σ = 392161500. Its totient is φ = 130590064.

The previous prime is 261310549. The next prime is 261310571. The reversal of 261310562 is 265013162.

It can be written as a sum of positive squares in 2 ways, for example, as 235898881 + 25411681 = 15359^2 + 5041^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27437 + ... + 35712.

Almost surely, 2^261310562 is an apocalyptic number.

261310562 is a deficient number, since it is larger than the sum of its proper divisors (130850938).

261310562 is a wasteful number, since it uses less digits than its factorization.

261310562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65220.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 261310562 is about 16165.1032164969. The cubic root of 261310562 is about 639.3210263534.

The spelling of 261310562 in words is "two hundred sixty-one million, three hundred ten thousand, five hundred sixty-two".