1516242397 has 2 divisors, whose sum is σ = 1516242398. Its totient is φ = 1516242396.

The previous prime is 1516242349. The next prime is 1516242437. The reversal of 1516242397 is 7932426151.

It is a happy number.

It is an a-pointer prime, because the next prime (1516242437) can be obtained adding 1516242397 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 918635481 + 597606916 = 30309^2 + 24446^2 .

It is a cyclic number.

It is not a de Polignac number, because 1516242397 - 2⁷ = 1516242269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1516242337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758121198 + 758121199.

It is an arithmetic number, because the mean of its divisors is an integer number (758121199).

Almost surely, 2^1516242397 is an apocalyptic number.

It is an amenable number.

1516242397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1516242397 is an equidigital number, since it uses as much as digits as its factorization.

1516242397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 1516242397 is about 38938.9573178327. The cubic root of 1516242397 is about 1148.8311746364.

The spelling of 1516242397 in words is "one billion, five hundred sixteen million, two hundred forty-two thousand, three hundred ninety-seven".