1611916651 has 2 divisors, whose sum is σ = 1611916652. Its totient is φ = 1611916650.

The previous prime is 1611916597. The next prime is 1611916667. The reversal of 1611916651 is 1566191161.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1566191161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1611916651 - 2²¹ = 1609819499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1611916651.

It is not a weakly prime, because it can be changed into another prime (1611916051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805958325 + 805958326.

It is an arithmetic number, because the mean of its divisors is an integer number (805958326).

Almost surely, 2^1611916651 is an apocalyptic number.

1611916651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611916651 is an equidigital number, since it uses as much as digits as its factorization.

1611916651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 37.

The square root of 1611916651 is about 40148.6818089959. The cubic root of 1611916651 is about 1172.5036243586.

The spelling of 1611916651 in words is "one billion, six hundred eleven million, nine hundred sixteen thousand, six hundred fifty-one".