2391997 has 2 divisors, whose sum is σ = 2391998. Its totient is φ = 2391996.

The previous prime is 2391979. The next prime is 2392001. The reversal of 2391997 is 7991932.

Together with previous prime (2391979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1792921 + 599076 = 1339^2 + 774^2 .

It is a cyclic number.

It is not a de Polignac number, because 2391997 - 2¹⁵ = 2359229 is a prime.

It is a Chen prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2391937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1195998 + 1195999.

It is an arithmetic number, because the mean of its divisors is an integer number (1195999).

2^2391997 is an apocalyptic number.

It is an amenable number.

2391997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2391997 is an equidigital number, since it uses as much as digits as its factorization.

2391997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 40.

The square root of 2391997 is about 1546.6082244706. The cubic root of 2391997 is about 133.7376056294.

The spelling of 2391997 in words is "two million, three hundred ninety-one thousand, nine hundred ninety-seven".