11811951 has 12 divisors (see below), whose sum is σ = 17384328. Its totient is φ = 7725744.

The previous prime is 11811929. The next prime is 11811953. The reversal of 11811951 is 15911811.

It is not a de Polignac number, because 11811951 - 2⁶ = 11811887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11811953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11905 + ... + 12858.

It is an arithmetic number, because the mean of its divisors is an integer number (1448694).

Almost surely, 2^11811951 is an apocalyptic number.

11811951 is a deficient number, since it is larger than the sum of its proper divisors (5572377).

11811951 is a wasteful number, since it uses less digits than its factorization.

11811951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24822 (or 24819 counting only the distinct ones).

The product of its digits is 360, while the sum is 27.

The square root of 11811951 is about 3436.8519025410. The cubic root of 11811951 is about 227.7406446088.

The spelling of 11811951 in words is "eleven million, eight hundred eleven thousand, nine hundred fifty-one".