1131913487 has 4 divisors (see below), whose sum is σ = 1131984720. Its totient is φ = 1131842256.

The previous prime is 1131913483. The next prime is 1131913493. The reversal of 1131913487 is 7843191311.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7843191311 = 18229 ⋅430259.

It is a cyclic number.

It is not a de Polignac number, because 1131913487 - 2² = 1131913483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131913487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131913483) 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, 278 + ... + 47580.

It is an arithmetic number, because the mean of its divisors is an integer number (282996180).

Almost surely, 2^1131913487 is an apocalyptic number.

1131913487 is a deficient number, since it is larger than the sum of its proper divisors (71233).

1131913487 is an equidigital number, since it uses as much as digits as its factorization.

1131913487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71232.

The product of its digits is 18144, while the sum is 38.

The square root of 1131913487 is about 33643.9219919438. The cubic root of 1131913487 is about 1042.1680263051.

The spelling of 1131913487 in words is "one billion, one hundred thirty-one million, nine hundred thirteen thousand, four hundred eighty-seven".