815207144237 has 2 divisors, whose sum is σ = 815207144238. Its totient is φ = 815207144236.

The previous prime is 815207144231. The next prime is 815207144251. The reversal of 815207144237 is 732441702518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 811694685481 + 3512458756 = 900941^2 + 59266^2 .

It is a cyclic number.

It is not a de Polignac number, because 815207144237 - 2⁴ = 815207144221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815207144231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407603572118 + 407603572119.

It is an arithmetic number, because the mean of its divisors is an integer number (407603572119).

Almost surely, 2^815207144237 is an apocalyptic number.

It is an amenable number.

815207144237 is a deficient number, since it is larger than the sum of its proper divisors (1).

815207144237 is an equidigital number, since it uses as much as digits as its factorization.

815207144237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 376320, while the sum is 44.

The spelling of 815207144237 in words is "eight hundred fifteen billion, two hundred seven million, one hundred forty-four thousand, two hundred thirty-seven".