11640431 has 4 divisors (see below), whose sum is σ = 12698664. Its totient is φ = 10582200.

The previous prime is 11640403. The next prime is 11640457. The reversal of 11640431 is 13404611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13404611 = 11 ⋅1218601.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11640431 is a prime.

It is a super-2 number, since 2×11640431² = 270999267731522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11640481) 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, 529100 + ... + 529121.

It is an arithmetic number, because the mean of its divisors is an integer number (3174666).

Almost surely, 2^11640431 is an apocalyptic number.

11640431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11640431 is a deficient number, since it is larger than the sum of its proper divisors (1058233).

11640431 is a wasteful number, since it uses less digits than its factorization.

11640431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058232.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 11640431 is about 3411.8075854303. The cubic root of 11640431 is about 226.6329335132.

The spelling of 11640431 in words is "eleven million, six hundred forty thousand, four hundred thirty-one".