261116955 has 96 divisors (see below), whose sum is σ = 518581440. Its totient is φ = 120407040.

The previous prime is 261116951. The next prime is 261116959. The reversal of 261116955 is 559611162.

It is an interprime number because it is at equal distance from previous prime (261116951) and next prime (261116959).

It is not a de Polignac number, because 261116955 - 2² = 261116951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261116951) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 970561 + ... + 970829.

It is an arithmetic number, because the mean of its divisors is an integer number (5401890).

Almost surely, 2^261116955 is an apocalyptic number.

261116955 is a deficient number, since it is larger than the sum of its proper divisors (257464485).

261116955 is a wasteful number, since it uses less digits than its factorization.

261116955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381 (or 378 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 261116955 is about 16159.1136823775. The cubic root of 261116955 is about 639.1630947250.

The spelling of 261116955 in words is "two hundred sixty-one million, one hundred sixteen thousand, nine hundred fifty-five".