1616291 has 2 divisors, whose sum is σ = 1616292. Its totient is φ = 1616290.

The previous prime is 1616281. The next prime is 1616297. The reversal of 1616291 is 1926161.

It is a strong prime.

It is an emirp because it is prime and its reverse (1926161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1616291 - 2⁶ = 1616227 is a prime.

It is a super-2 number, since 2×1616291² = 5224793193362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1616291.

It is not a weakly prime, because it can be changed into another prime (1616297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808145 + 808146.

It is an arithmetic number, because the mean of its divisors is an integer number (808146).

2^1616291 is an apocalyptic number.

1616291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616291 is an equidigital number, since it uses as much as digits as its factorization.

1616291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 1616291 is about 1271.3343384020. The cubic root of 1616291 is about 117.3563296079.

The spelling of 1616291 in words is "one million, six hundred sixteen thousand, two hundred ninety-one".