1516611641 has 2 divisors, whose sum is σ = 1516611642. Its totient is φ = 1516611640.

The previous prime is 1516611631. The next prime is 1516611683. The reversal of 1516611641 is 1461166151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 931165225 + 585446416 = 30515^2 + 24196^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1516611641 is a prime.

It is a super-2 number, since 2×1516611641² = 4600221739233425762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1516611598 and 1516611607.

It is not a weakly prime, because it can be changed into another prime (1516611601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758305820 + 758305821.

It is an arithmetic number, because the mean of its divisors is an integer number (758305821).

Almost surely, 2^1516611641 is an apocalyptic number.

It is an amenable number.

1516611641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1516611641 is an equidigital number, since it uses as much as digits as its factorization.

1516611641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 32.

The square root of 1516611641 is about 38943.6983477430. The cubic root of 1516611641 is about 1148.9244237082.

Adding to 1516611641 its reverse (1461166151), we get a palindrome (2977777792).

The spelling of 1516611641 in words is "one billion, five hundred sixteen million, six hundred eleven thousand, six hundred forty-one".