1318249157 has 2 divisors, whose sum is σ = 1318249158. Its totient is φ = 1318249156.

The previous prime is 1318249147. The next prime is 1318249159. The reversal of 1318249157 is 7519428131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 993132196 + 325116961 = 31514^2 + 18031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1318249157 is a prime.

Together with 1318249159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1318249159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659124578 + 659124579.

It is an arithmetic number, because the mean of its divisors is an integer number (659124579).

Almost surely, 2^1318249157 is an apocalyptic number.

It is an amenable number.

1318249157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318249157 is an equidigital number, since it uses as much as digits as its factorization.

1318249157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 1318249157 is about 36307.7010701587. The cubic root of 1318249157 is about 1096.4760941178.

The spelling of 1318249157 in words is "one billion, three hundred eighteen million, two hundred forty-nine thousand, one hundred fifty-seven".