1616631 has 4 divisors (see below), whose sum is σ = 2155512. Its totient is φ = 1077752.

The previous prime is 1616627. The next prime is 1616633. The reversal of 1616631 is 1366161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1616631 - 2² = 1616627 is a prime.

It is a super-2 number, since 2×1616631² = 5226991580322, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616633) 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 in 3 ways as a sum of consecutive naturals, for example, 269436 + ... + 269441.

It is an arithmetic number, because the mean of its divisors is an integer number (538878).

2^1616631 is an apocalyptic number.

1616631 is a deficient number, since it is larger than the sum of its proper divisors (538881).

1616631 is an equidigital number, since it uses as much as digits as its factorization.

1616631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538880.

The product of its digits is 648, while the sum is 24.

The square root of 1616631 is about 1271.4680491463. The cubic root of 1616631 is about 117.3645579848.

The spelling of 1616631 in words is "one million, six hundred sixteen thousand, six hundred thirty-one".