1249807157 has 2 divisors, whose sum is σ = 1249807158. Its totient is φ = 1249807156.

The previous prime is 1249807147. The next prime is 1249807199. The reversal of 1249807157 is 7517089421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1185149476 + 64657681 = 34426^2 + 8041^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249807157 - 2¹⁰ = 1249806133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249807147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624903578 + 624903579.

It is an arithmetic number, because the mean of its divisors is an integer number (624903579).

Almost surely, 2^1249807157 is an apocalyptic number.

It is an amenable number.

1249807157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249807157 is an equidigital number, since it uses as much as digits as its factorization.

1249807157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 44.

The square root of 1249807157 is about 35352.6117422744. The cubic root of 1249807157 is about 1077.1619464805.

The spelling of 1249807157 in words is "one billion, two hundred forty-nine million, eight hundred seven thousand, one hundred fifty-seven".