1631431 has 4 divisors (see below), whose sum is σ = 1671264. Its totient is φ = 1591600.

The previous prime is 1631407. The next prime is 1631447. The reversal of 1631431 is 1341361.

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 1631431 - 2⁹ = 1630919 is a prime.

It is a super-2 number, since 2×1631431² = 5323134215522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1631399 and 1631408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631471) 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 in 3 ways as a sum of consecutive naturals, for example, 19855 + ... + 19936.

It is an arithmetic number, because the mean of its divisors is an integer number (417816).

2^1631431 is an apocalyptic number.

1631431 is a deficient number, since it is larger than the sum of its proper divisors (39833).

1631431 is an equidigital number, since it uses as much as digits as its factorization.

1631431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39832.

The product of its digits is 216, while the sum is 19.

The square root of 1631431 is about 1277.2748333855. The cubic root of 1631431 is about 117.7216218654.

Adding to 1631431 its reverse (1341361), we get a palindrome (2972792).

The spelling of 1631431 in words is "one million, six hundred thirty-one thousand, four hundred thirty-one".