1516319797 has 2 divisors, whose sum is σ = 1516319798. Its totient is φ = 1516319796.

The previous prime is 1516319773. The next prime is 1516319809. The reversal of 1516319797 is 7979136151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1477556721 + 38763076 = 38439^2 + 6226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1516319797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1516319797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1516319737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758159898 + 758159899.

It is an arithmetic number, because the mean of its divisors is an integer number (758159899).

Almost surely, 2^1516319797 is an apocalyptic number.

It is an amenable number.

1516319797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1516319797 is an equidigital number, since it uses as much as digits as its factorization.

1516319797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 357210, while the sum is 49.

The square root of 1516319797 is about 38939.9511684337. The cubic root of 1516319797 is about 1148.8507225266.

The spelling of 1516319797 in words is "one billion, five hundred sixteen million, three hundred nineteen thousand, seven hundred ninety-seven".