1136949891 has 24 divisors (see below), whose sum is σ = 1923747264. Its totient is φ = 590622480.

The previous prime is 1136949859. The next prime is 1136949899. The reversal of 1136949891 is 1989496311.

It is not a de Polignac number, because 1136949891 - 2⁵ = 1136949859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1136949899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 349945 + ... + 353178.

It is an arithmetic number, because the mean of its divisors is an integer number (80156136).

Almost surely, 2^1136949891 is an apocalyptic number.

1136949891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1136949891 is a deficient number, since it is larger than the sum of its proper divisors (786797373).

1136949891 is a wasteful number, since it uses less digits than its factorization.

1136949891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703151 (or 703144 counting only the distinct ones).

The product of its digits is 419904, while the sum is 51.

The square root of 1136949891 is about 33718.6875634269. The cubic root of 1136949891 is about 1043.7114345008.

The spelling of 1136949891 in words is "one billion, one hundred thirty-six million, nine hundred forty-nine thousand, eight hundred ninety-one".