1245944137 has 2 divisors, whose sum is σ = 1245944138. Its totient is φ = 1245944136.

The previous prime is 1245944131. The next prime is 1245944149. The reversal of 1245944137 is 7314495421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1015633161 + 230310976 = 31869^2 + 15176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245944137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1245944137.

It is not a weakly prime, because it can be changed into another prime (1245944131) 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, 622972068 + 622972069.

It is an arithmetic number, because the mean of its divisors is an integer number (622972069).

Almost surely, 2^1245944137 is an apocalyptic number.

It is an amenable number.

1245944137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245944137 is an equidigital number, since it uses as much as digits as its factorization.

1245944137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The square root of 1245944137 is about 35297.9338913767. The cubic root of 1245944137 is about 1076.0510037067.

The spelling of 1245944137 in words is "one billion, two hundred forty-five million, nine hundred forty-four thousand, one hundred thirty-seven".