1312501249 has 2 divisors, whose sum is σ = 1312501250. Its totient is φ = 1312501248.

The previous prime is 1312501231. The next prime is 1312501283. The reversal of 1312501249 is 9421052131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1283932224 + 28569025 = 35832^2 + 5345^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312501249 - 2⁹ = 1312500737 is a prime.

It is a super-3 number, since 3×1312501249³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1312501549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656250624 + 656250625.

It is an arithmetic number, because the mean of its divisors is an integer number (656250625).

Almost surely, 2^1312501249 is an apocalyptic number.

It is an amenable number.

1312501249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312501249 is an equidigital number, since it uses as much as digits as its factorization.

1312501249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1312501249 is about 36228.4591033072. The cubic root of 1312501249 is about 1094.8801322747.

The spelling of 1312501249 in words is "one billion, three hundred twelve million, five hundred one thousand, two hundred forty-nine".