11887551 has 12 divisors (see below), whose sum is σ = 18491928. Its totient is φ = 7315344.

The previous prime is 11887549. The next prime is 11887553. The reversal of 11887551 is 15578811.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11887549) and next prime (11887553).

It is not a de Polignac number, because 11887551 - 2¹ = 11887549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11887553) 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, 50685 + ... + 50918.

It is an arithmetic number, because the mean of its divisors is an integer number (1540994).

Almost surely, 2^11887551 is an apocalyptic number.

11887551 is a deficient number, since it is larger than the sum of its proper divisors (6604377).

11887551 is a wasteful number, since it uses less digits than its factorization.

11887551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101622 (or 101619 counting only the distinct ones).

The product of its digits is 11200, while the sum is 36.

The square root of 11887551 is about 3447.8327975701. The cubic root of 11887551 is about 228.2254809995.

The spelling of 11887551 in words is "eleven million, eight hundred eighty-seven thousand, five hundred fifty-one".