1131253961 has 4 divisors (see below), whose sum is σ = 1141265172. Its totient is φ = 1121242752.

The previous prime is 1131253931. The next prime is 1131253973. The reversal of 1131253961 is 1693521311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 477684736 + 653569225 = 21856^2 + 25565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131253961 - 2²² = 1127059657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131253931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5005436 + ... + 5005661.

It is an arithmetic number, because the mean of its divisors is an integer number (285316293).

Almost surely, 2^1131253961 is an apocalyptic number.

It is an amenable number.

1131253961 is a deficient number, since it is larger than the sum of its proper divisors (10011211).

1131253961 is a wasteful number, since it uses less digits than its factorization.

1131253961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10011210.

The product of its digits is 4860, while the sum is 32.

The square root of 1131253961 is about 33634.1190013950. The cubic root of 1131253961 is about 1041.9655754828.

The spelling of 1131253961 in words is "one billion, one hundred thirty-one million, two hundred fifty-three thousand, nine hundred sixty-one".