11989951 has 2 divisors, whose sum is σ = 11989952. Its totient is φ = 11989950.

The previous prime is 11989927. The next prime is 11989973. The reversal of 11989951 is 15998911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11989951 - 2⁵ = 11989919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11989898 and 11989907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11989051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5994975 + 5994976.

It is an arithmetic number, because the mean of its divisors is an integer number (5994976).

Almost surely, 2^11989951 is an apocalyptic number.

11989951 is a deficient number, since it is larger than the sum of its proper divisors (1).

11989951 is an equidigital number, since it uses as much as digits as its factorization.

11989951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 43.

The square root of 11989951 is about 3462.6508631394. The cubic root of 11989951 is about 228.8789238111.

The spelling of 11989951 in words is "eleven million, nine hundred eighty-nine thousand, nine hundred fifty-one".