1693631 has 2 divisors, whose sum is σ = 1693632. Its totient is φ = 1693630.

The previous prime is 1693621. The next prime is 1693633. The reversal of 1693631 is 1363961.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1693631 is a prime.

It is a super-2 number, since 2×1693631² = 5736771928322, which contains 22 as substring.

Together with 1693633, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₁₂₇₆₈₅ and since 1693631 and 127685 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 1693594 and 1693603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1693633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 846815 + 846816.

It is an arithmetic number, because the mean of its divisors is an integer number (846816).

2^1693631 is an apocalyptic number.

1693631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1693631 is an equidigital number, since it uses as much as digits as its factorization.

1693631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 29.

The square root of 1693631 is about 1301.3957891433. The cubic root of 1693631 is about 119.1990876843.

The spelling of 1693631 in words is "one million, six hundred ninety-three thousand, six hundred thirty-one".