1643089849631 has 2 divisors, whose sum is σ = 1643089849632. Its totient is φ = 1643089849630.

The previous prime is 1643089849627. The next prime is 1643089849663. The reversal of 1643089849631 is 1369489803461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1643089849631 - 2² = 1643089849627 is a prime.

It is a super-2 number, since 2×1643089849631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643089849931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821544924815 + 821544924816.

It is an arithmetic number, because the mean of its divisors is an integer number (821544924816).

Almost surely, 2^{1643089849631} is an apocalyptic number.

1643089849631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643089849631 is an equidigital number, since it uses as much as digits as its factorization.

1643089849631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26873856, while the sum is 62.

The spelling of 1643089849631 in words is "one trillion, six hundred forty-three billion, eighty-nine million, eight hundred forty-nine thousand, six hundred thirty-one".