11987251 has 4 divisors (see below), whose sum is σ = 12034152. Its totient is φ = 11940352.

The previous prime is 11987249. The next prime is 11987263. The reversal of 11987251 is 15278911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15278911 = 29 ⋅526859.

It is a cyclic number.

It is not a de Polignac number, because 11987251 - 2¹ = 11987249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11987201) 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, 23065 + ... + 23578.

It is an arithmetic number, because the mean of its divisors is an integer number (3008538).

Almost surely, 2^11987251 is an apocalyptic number.

11987251 is a deficient number, since it is larger than the sum of its proper divisors (46901).

11987251 is an equidigital number, since it uses as much as digits as its factorization.

11987251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46900.

The product of its digits is 5040, while the sum is 34.

The square root of 11987251 is about 3462.2609664784. The cubic root of 11987251 is about 228.8617422150.

The spelling of 11987251 in words is "eleven million, nine hundred eighty-seven thousand, two hundred fifty-one".