261464139 has 16 divisors (see below), whose sum is σ = 387642400. Its totient is φ = 174179808.

The previous prime is 261464129. The next prime is 261464213. The reversal of 261464139 is 931464162.

261464139 is a `hidden beast` number, since 2 + 6 + 1 + 4 + 641 + 3 + 9 = 666.

261464139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261464139 - 2⁵ = 261464107 is a prime.

It is a super-2 number, since 2×261464139² = 136726991966022642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261464129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45597 + ... + 51009.

It is an arithmetic number, because the mean of its divisors is an integer number (24227650).

Almost surely, 2^261464139 is an apocalyptic number.

261464139 is a deficient number, since it is larger than the sum of its proper divisors (126178261).

261464139 is a wasteful number, since it uses less digits than its factorization.

261464139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7211 (or 7205 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 261464139 is about 16169.8527822612. The cubic root of 261464139 is about 639.4462487142.

The spelling of 261464139 in words is "two hundred sixty-one million, four hundred sixty-four thousand, one hundred thirty-nine".