1191283131 has 16 divisors (see below), whose sum is σ = 1613934080. Its totient is φ = 781462080.

The previous prime is 1191283129. The next prime is 1191283139. The reversal of 1191283131 is 1313821911.

It is not a de Polignac number, because 1191283131 - 2¹ = 1191283129 is a prime.

It is a super-2 number, since 2×1191283131² = 2838310996410326322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1191283139) 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, 89946 + ... + 102336.

It is an arithmetic number, because the mean of its divisors is an integer number (100870880).

Almost surely, 2^1191283131 is an apocalyptic number.

1191283131 is a deficient number, since it is larger than the sum of its proper divisors (422650949).

1191283131 is a wasteful number, since it uses less digits than its factorization.

1191283131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12906.

The product of its digits is 1296, while the sum is 30.

The square root of 1191283131 is about 34514.9696653496. The cubic root of 1191283131 is about 1060.0792426222.

The spelling of 1191283131 in words is "one billion, one hundred ninety-one million, two hundred eighty-three thousand, one hundred thirty-one".