1631330643 has 4 divisors (see below), whose sum is σ = 2175107528. Its totient is φ = 1087553760.

The previous prime is 1631330611. The next prime is 1631330663. The reversal of 1631330643 is 3460331361.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1631330643 - 2⁵ = 1631330611 is a prime.

It is a super-2 number, since 2×1631330643² = 5322479333581586898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1631330643.

It is not an unprimeable number, because it can be changed into a prime (1631330663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271888438 + ... + 271888443.

It is an arithmetic number, because the mean of its divisors is an integer number (543776882).

Almost surely, 2^1631330643 is an apocalyptic number.

1631330643 is a deficient number, since it is larger than the sum of its proper divisors (543776885).

1631330643 is an equidigital number, since it uses as much as digits as its factorization.

1631330643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543776884.

The product of its (nonzero) digits is 11664, while the sum is 30.

The square root of 1631330643 is about 40389.7343764477. The cubic root of 1631330643 is about 1177.1920794551.

The spelling of 1631330643 in words is "one billion, six hundred thirty-one million, three hundred thirty thousand, six hundred forty-three".