1612991 has 2 divisors, whose sum is σ = 1612992. Its totient is φ = 1612990.

The previous prime is 1612957. The next prime is 1612997. The reversal of 1612991 is 1992161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1612991 - 2⁶ = 1612927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1612997) 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, 806495 + 806496.

It is an arithmetic number, because the mean of its divisors is an integer number (806496).

2^1612991 is an apocalyptic number.

1612991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1612991 is an equidigital number, since it uses as much as digits as its factorization.

1612991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 29.

The square root of 1612991 is about 1270.0358262663. The cubic root of 1612991 is about 117.2764059317.

The spelling of 1612991 in words is "one million, six hundred twelve thousand, nine hundred ninety-one".