1261432287 has 12 divisors (see below), whose sum is σ = 1917967480. Its totient is φ = 796693968.

The previous prime is 1261432279. The next prime is 1261432297. The reversal of 1261432287 is 7822341621.

It is a happy number.

1261432287 is a `hidden beast` number, since 1 + 2 + 614 + 32 + 2 + 8 + 7 = 666.

It is not a de Polignac number, because 1261432287 - 2³ = 1261432279 is a prime.

It is a super-2 number, since 2×1261432287² = 3182422829372100738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261432297) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3688228 + ... + 3688569.

Almost surely, 2^1261432287 is an apocalyptic number.

1261432287 is a deficient number, since it is larger than the sum of its proper divisors (656535193).

1261432287 is a wasteful number, since it uses less digits than its factorization.

1261432287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7376822 (or 7376819 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 1261432287 is about 35516.6480259610. The cubic root of 1261432287 is about 1080.4913993221.

The spelling of 1261432287 in words is "one billion, two hundred sixty-one million, four hundred thirty-two thousand, two hundred eighty-seven".