1623631 has 2 divisors, whose sum is σ = 1623632. Its totient is φ = 1623630.

The previous prime is 1623599. The next prime is 1623647. The reversal of 1623631 is 1363261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1623631 - 2⁵ = 1623599 is a prime.

It is a super-2 number, since 2×1623631² = 5272355248322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1623431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811815 + 811816.

It is an arithmetic number, because the mean of its divisors is an integer number (811816).

2^1623631 is an apocalyptic number.

1623631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623631 is an equidigital number, since it uses as much as digits as its factorization.

1623631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 22.

The square root of 1623631 is about 1274.2177992792. The cubic root of 1623631 is about 117.5337099597.

Adding to 1623631 its reverse (1363261), we get a palindrome (2986892).

The spelling of 1623631 in words is "one million, six hundred twenty-three thousand, six hundred thirty-one".