11991937 has 2 divisors, whose sum is σ = 11991938. Its totient is φ = 11991936.

The previous prime is 11991913. The next prime is 11991943. The reversal of 11991937 is 73919911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11128896 + 863041 = 3336^2 + 929^2 .

It is a cyclic number.

It is not a de Polignac number, because 11991937 - 2²³ = 3603329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11991937.

It is not a weakly prime, because it can be changed into another prime (11991977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5995968 + 5995969.

It is an arithmetic number, because the mean of its divisors is an integer number (5995969).

Almost surely, 2^11991937 is an apocalyptic number.

It is an amenable number.

11991937 is a deficient number, since it is larger than the sum of its proper divisors (1).

11991937 is an equidigital number, since it uses as much as digits as its factorization.

11991937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15309, while the sum is 40.

The square root of 11991937 is about 3462.9376257738. The cubic root of 11991937 is about 228.8915601832.

It can be divided in two parts, 1199 and 1937, that added together give a square (3136 = 56²).

The spelling of 11991937 in words is "eleven million, nine hundred ninety-one thousand, nine hundred thirty-seven".