11357991 has 24 divisors (see below), whose sum is σ = 17438720. Its totient is φ = 7103376.

The previous prime is 11357981. The next prime is 11357993. The reversal of 11357991 is 19975311.

It is not a de Polignac number, because 11357991 - 2⁵ = 11357959 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11357993) 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, 21456 + ... + 21978.

Almost surely, 2^11357991 is an apocalyptic number.

11357991 is a deficient number, since it is larger than the sum of its proper divisors (6080729).

11357991 is a wasteful number, since it uses less digits than its factorization.

11357991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 672 counting only the distinct ones).

The product of its digits is 8505, while the sum is 36.

The square root of 11357991 is about 3370.1618655489. The cubic root of 11357991 is about 224.7849203948.

The spelling of 11357991 in words is "eleven million, three hundred fifty-seven thousand, nine hundred ninety-one".