1516965521 has 2 divisors, whose sum is σ = 1516965522. Its totient is φ = 1516965520.

The previous prime is 1516965511. The next prime is 1516965577. The reversal of 1516965521 is 1255696151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1113156496 + 403809025 = 33364^2 + 20095^2 .

It is an emirp because it is prime and its reverse (1255696151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1516965521 - 2²⁶ = 1449856657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1516965511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758482760 + 758482761.

It is an arithmetic number, because the mean of its divisors is an integer number (758482761).

Almost surely, 2^1516965521 is an apocalyptic number.

It is an amenable number.

1516965521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1516965521 is an equidigital number, since it uses as much as digits as its factorization.

1516965521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 41.

The square root of 1516965521 is about 38948.2415649282. The cubic root of 1516965521 is about 1149.0137785447.

The spelling of 1516965521 in words is "one billion, five hundred sixteen million, nine hundred sixty-five thousand, five hundred twenty-one".