1616608691 has 2 divisors, whose sum is σ = 1616608692. Its totient is φ = 1616608690.

The previous prime is 1616608661. The next prime is 1616608717. The reversal of 1616608691 is 1968066161.

It is a strong prime.

It is an emirp because it is prime and its reverse (1968066161) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1698099191 and 1919908961.

It is a cyclic number.

It is not a de Polignac number, because 1616608691 - 2⁶ = 1616608627 is a prime.

It is a super-2 number, since 2×1616608691² = 5226847319633466962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1616608621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808304345 + 808304346.

It is an arithmetic number, because the mean of its divisors is an integer number (808304346).

Almost surely, 2^1616608691 is an apocalyptic number.

1616608691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616608691 is an equidigital number, since it uses as much as digits as its factorization.

1616608691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 1616608691 is about 40207.0726489756. The cubic root of 1616608691 is about 1173.6401811768.

The spelling of 1616608691 in words is "one billion, six hundred sixteen million, six hundred eight thousand, six hundred ninety-one".