1329631 has 2 divisors, whose sum is σ = 1329632. Its totient is φ = 1329630.

The previous prime is 1329623. The next prime is 1329637. The reversal of 1329631 is 1369231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1329631 - 2³ = 1329623 is a prime.

It is a super-2 number, since 2×1329631² = 3535837192322, which contains 22 as substring.

1329631 is a lucky number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1329596 and 1329605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1329637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664815 + 664816.

It is an arithmetic number, because the mean of its divisors is an integer number (664816).

2^1329631 is an apocalyptic number.

1329631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1329631 is an equidigital number, since it uses as much as digits as its factorization.

1329631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 25.

The square root of 1329631 is about 1153.0962665797. The cubic root of 1329631 is about 109.9622735639.

The spelling of 1329631 in words is "one million, three hundred twenty-nine thousand, six hundred thirty-one".