1129615999 has 4 divisors (see below), whose sum is σ = 1130022664. Its totient is φ = 1129209336.

The previous prime is 1129615979. The next prime is 1129616011. The reversal of 1129615999 is 9995169211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9995169211 = 937 ⋅10667203.

It is a cyclic number.

It is not a de Polignac number, because 1129615999 - 2⁵ = 1129615967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1129615909) 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, 199137 + ... + 204730.

It is an arithmetic number, because the mean of its divisors is an integer number (282505666).

Almost surely, 2^1129615999 is an apocalyptic number.

1129615999 is a deficient number, since it is larger than the sum of its proper divisors (406665).

1129615999 is an equidigital number, since it uses as much as digits as its factorization.

1129615999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406664.

The product of its digits is 393660, while the sum is 52.

The square root of 1129615999 is about 33609.7604722200. The cubic root of 1129615999 is about 1041.4624392994.

The spelling of 1129615999 in words is "one billion, one hundred twenty-nine million, six hundred fifteen thousand, nine hundred ninety-nine".