11987951 has 2 divisors, whose sum is σ = 11987952. Its totient is φ = 11987950.

The previous prime is 11987923. The next prime is 11987953. The reversal of 11987951 is 15978911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11987951 - 2¹⁴ = 11971567 is a prime.

Together with 11987953, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11987899 and 11987908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11987953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5993975 + 5993976.

It is an arithmetic number, because the mean of its divisors is an integer number (5993976).

Almost surely, 2^11987951 is an apocalyptic number.

11987951 is a deficient number, since it is larger than the sum of its proper divisors (1).

11987951 is an equidigital number, since it uses as much as digits as its factorization.

11987951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 41.

The square root of 11987951 is about 3462.3620550139. The cubic root of 11987951 is about 228.8661969506.

The spelling of 11987951 in words is "eleven million, nine hundred eighty-seven thousand, nine hundred fifty-one".