261412279 has 16 divisors (see below), whose sum is σ = 279208800. Its totient is φ = 244048896.

The previous prime is 261412259. The next prime is 261412309. The reversal of 261412279 is 972214162.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261412279 is a prime.

It is a super-2 number, since 2×261412279² = 136672759223947682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261412259) 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, 671817 + ... + 672205.

It is an arithmetic number, because the mean of its divisors is an integer number (17450550).

Almost surely, 2^261412279 is an apocalyptic number.

261412279 is a deficient number, since it is larger than the sum of its proper divisors (17796521).

261412279 is a wasteful number, since it uses less digits than its factorization.

261412279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834.

The product of its digits is 12096, while the sum is 34.

The square root of 261412279 is about 16168.2491012478. The cubic root of 261412279 is about 639.4039690154.

The spelling of 261412279 in words is "two hundred sixty-one million, four hundred twelve thousand, two hundred seventy-nine".