1631326943 has 4 divisors (see below), whose sum is σ = 1632024360. Its totient is φ = 1630629528.

The previous prime is 1631326913. The next prime is 1631326951. The reversal of 1631326943 is 3496231361.

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 1631326943 - 2¹⁰ = 1631325919 is a prime.

It is a super-2 number, since 2×1631326943² = 5322455189915450498, 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 = 1631326897 and 1631326906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631326913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345188 + ... + 349881.

It is an arithmetic number, because the mean of its divisors is an integer number (408006090).

Almost surely, 2^1631326943 is an apocalyptic number.

1631326943 is a deficient number, since it is larger than the sum of its proper divisors (697417).

1631326943 is an equidigital number, since it uses as much as digits as its factorization.

1631326943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697416.

The product of its digits is 69984, while the sum is 38.

The square root of 1631326943 is about 40389.6885727038. The cubic root of 1631326943 is about 1177.1911894630.

The spelling of 1631326943 in words is "one billion, six hundred thirty-one million, three hundred twenty-six thousand, nine hundred forty-three".