1298242157 has 2 divisors, whose sum is σ = 1298242158. Its totient is φ = 1298242156.

The previous prime is 1298242129. The next prime is 1298242201. The reversal of 1298242157 is 7512428921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1232080201 + 66161956 = 35101^2 + 8134^2 .

It is a cyclic number.

It is not a de Polignac number, because 1298242157 - 2²⁰ = 1297193581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1298242457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649121078 + 649121079.

It is an arithmetic number, because the mean of its divisors is an integer number (649121079).

Almost surely, 2^1298242157 is an apocalyptic number.

It is an amenable number.

1298242157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1298242157 is an equidigital number, since it uses as much as digits as its factorization.

1298242157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 41.

The square root of 1298242157 is about 36031.1276121078. The cubic root of 1298242157 is about 1090.9007387759.

The spelling of 1298242157 in words is "one billion, two hundred ninety-eight million, two hundred forty-two thousand, one hundred fifty-seven".