1612905491 has 2 divisors, whose sum is σ = 1612905492. Its totient is φ = 1612905490.

The previous prime is 1612905473. The next prime is 1612905493. The reversal of 1612905491 is 1945092161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1612905491 is a prime.

Together with 1612905493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1612905493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806452745 + 806452746.

It is an arithmetic number, because the mean of its divisors is an integer number (806452746).

Almost surely, 2^1612905491 is an apocalyptic number.

1612905491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1612905491 is an equidigital number, since it uses as much as digits as its factorization.

1612905491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1612905491 is about 40160.9946465473. The cubic root of 1612905491 is about 1172.7433351567.

The spelling of 1612905491 in words is "one billion, six hundred twelve million, nine hundred five thousand, four hundred ninety-one".