1131532399 has 2 divisors, whose sum is σ = 1131532400. Its totient is φ = 1131532398.

The previous prime is 1131532387. The next prime is 1131532417. The reversal of 1131532399 is 9932351311.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131532399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131532319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565766199 + 565766200.

It is an arithmetic number, because the mean of its divisors is an integer number (565766200).

Almost surely, 2^1131532399 is an apocalyptic number.

1131532399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131532399 is an equidigital number, since it uses as much as digits as its factorization.

1131532399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 37.

The square root of 1131532399 is about 33638.2579661908. The cubic root of 1131532399 is about 1042.0510555552.

The spelling of 1131532399 in words is "one billion, one hundred thirty-one million, five hundred thirty-two thousand, three hundred ninety-nine".