11962991 has 2 divisors, whose sum is σ = 11962992. Its totient is φ = 11962990.

The previous prime is 11962981. The next prime is 11962997. The reversal of 11962991 is 19926911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11962991 - 2¹⁰ = 11961967 is a prime.

It is a super-2 number, since 2×11962991² = 286226307332162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11962997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5981495 + 5981496.

It is an arithmetic number, because the mean of its divisors is an integer number (5981496).

Almost surely, 2^11962991 is an apocalyptic number.

11962991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11962991 is an equidigital number, since it uses as much as digits as its factorization.

11962991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 38.

The square root of 11962991 is about 3458.7557011156. The cubic root of 11962991 is about 228.7072465312.

The spelling of 11962991 in words is "eleven million, nine hundred sixty-two thousand, nine hundred ninety-one".