11640451 has 4 divisors (see below), whose sum is σ = 11714752. Its totient is φ = 11566152.

The previous prime is 11640403. The next prime is 11640457. The reversal of 11640451 is 15404611.

11640451 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15404611 = 19 ⋅810769.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11640451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11640457) 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, 36915 + ... + 37228.

It is an arithmetic number, because the mean of its divisors is an integer number (2928688).

Almost surely, 2^11640451 is an apocalyptic number.

11640451 is a deficient number, since it is larger than the sum of its proper divisors (74301).

11640451 is an equidigital number, since it uses as much as digits as its factorization.

11640451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74300.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 11640451 is about 3411.8105164267. The cubic root of 11640451 is about 226.6330633096.

The spelling of 11640451 in words is "eleven million, six hundred forty thousand, four hundred fifty-one".