261290027 has 6 divisors (see below), whose sum is σ = 264266868. Its totient is φ = 258346352.

The previous prime is 261290009. The next prime is 261290063. The reversal of 261290027 is 720092162.

It is not a de Polignac number, because 261290027 - 2²⁰ = 260241451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261296027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8573 + ... + 24414.

It is an arithmetic number, because the mean of its divisors is an integer number (44044478).

Almost surely, 2^261290027 is an apocalyptic number.

261290027 is a deficient number, since it is larger than the sum of its proper divisors (2976841).

261290027 is an frugal number, since it uses more digits than its factorization.

261290027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33165 (or 33076 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 261290027 is about 16164.4680394995. The cubic root of 261290027 is about 639.3042789742.

The spelling of 261290027 in words is "two hundred sixty-one million, two hundred ninety thousand, twenty-seven".