1516251493 has 2 divisors, whose sum is σ = 1516251494. Its totient is φ = 1516251492.

The previous prime is 1516251487. The next prime is 1516251511. The reversal of 1516251493 is 3941526151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1514922084 + 1329409 = 38922^2 + 1153^2 .

It is a cyclic number.

It is not a de Polignac number, because 1516251493 - 2²⁹ = 979380581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1516251193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758125746 + 758125747.

It is an arithmetic number, because the mean of its divisors is an integer number (758125747).

Almost surely, 2^1516251493 is an apocalyptic number.

It is an amenable number.

1516251493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1516251493 is an equidigital number, since it uses as much as digits as its factorization.

1516251493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 37.

The square root of 1516251493 is about 38939.0741158544. The cubic root of 1516251493 is about 1148.8334719268.

It can be divided in two parts, 1516 and 251493, that added together give a square (253009 = 503²).

The spelling of 1516251493 in words is "one billion, five hundred sixteen million, two hundred fifty-one thousand, four hundred ninety-three".