2391281237 has 2 divisors, whose sum is σ = 2391281238. Its totient is φ = 2391281236.

The previous prime is 2391281219. The next prime is 2391281297. The reversal of 2391281237 is 7321821932.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1545983761 + 845297476 = 39319^2 + 29074^2 .

It is a cyclic number.

It is not a de Polignac number, because 2391281237 - 2²⁶ = 2324172373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2391281237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2391281297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1195640618 + 1195640619.

It is an arithmetic number, because the mean of its divisors is an integer number (1195640619).

Almost surely, 2^2391281237 is an apocalyptic number.

It is an amenable number.

2391281237 is a deficient number, since it is larger than the sum of its proper divisors (1).

2391281237 is an equidigital number, since it uses as much as digits as its factorization.

2391281237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 2391281237 is about 48900.7283892582. The cubic root of 2391281237 is about 1337.2426475708.

The spelling of 2391281237 in words is "two billion, three hundred ninety-one million, two hundred eighty-one thousand, two hundred thirty-seven".