11987151 has 16 divisors (see below), whose sum is σ = 17521920. Its totient is φ = 7229120.

The previous prime is 11987147. The next prime is 11987167. The reversal of 11987151 is 15178911.

It is a cyclic number.

It is not a de Polignac number, because 11987151 - 2² = 11987147 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11987141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6910 + ... + 8468.

It is an arithmetic number, because the mean of its divisors is an integer number (1095120).

Almost surely, 2^11987151 is an apocalyptic number.

11987151 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11987151 is a deficient number, since it is larger than the sum of its proper divisors (5534769).

11987151 is a wasteful number, since it uses less digits than its factorization.

11987151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806.

The product of its digits is 2520, while the sum is 33.

The square root of 11987151 is about 3462.2465250181. The cubic root of 11987151 is about 228.8611058100.

The spelling of 11987151 in words is "eleven million, nine hundred eighty-seven thousand, one hundred fifty-one".