1616391 has 12 divisors (see below), whose sum is σ = 2668432. Its totient is φ = 923616.

The previous prime is 1616359. The next prime is 1616401. The reversal of 1616391 is 1936161.

It is not a de Polignac number, because 1616391 - 2⁵ = 1616359 is a prime.

It is a super-2 number, since 2×1616391² = 5225439729762, which contains 22 as substring.

It is a Duffinian number.

1616391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12766 + ... + 12891.

2^1616391 is an apocalyptic number.

1616391 is a deficient number, since it is larger than the sum of its proper divisors (1052041).

1616391 is a wasteful number, since it uses less digits than its factorization.

1616391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25670 (or 25667 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 1616391 is about 1271.3736665513. The cubic root of 1616391 is about 117.3587498386.

The spelling of 1616391 in words is "one million, six hundred sixteen thousand, three hundred ninety-one".