1616812697 has 2 divisors, whose sum is σ = 1616812698. Its totient is φ = 1616812696.

The previous prime is 1616812679. The next prime is 1616812709. The reversal of 1616812697 is 7962186161.

Together with previous prime (1616812679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1509400201 + 107412496 = 38851^2 + 10364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1616812697 is a prime.

It is a super-2 number, since 2×1616812697² = 5228166594360827618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1616812627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808406348 + 808406349.

It is an arithmetic number, because the mean of its divisors is an integer number (808406349).

Almost surely, 2^1616812697 is an apocalyptic number.

It is an amenable number.

1616812697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616812697 is an equidigital number, since it uses as much as digits as its factorization.

1616812697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 1616812697 is about 40209.6095106630. The cubic root of 1616812697 is about 1173.6895478065.

The spelling of 1616812697 in words is "one billion, six hundred sixteen million, eight hundred twelve thousand, six hundred ninety-seven".