1643460631 has 8 divisors (see below), whose sum is σ = 1668111984. Its totient is φ = 1618992960.

The previous prime is 1643460617. The next prime is 1643460641. The reversal of 1643460631 is 1360643461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1643460631 - 2¹⁹ = 1642936343 is a prime.

It is a super-2 number, since 2×1643460631² = 5401925691293836322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643460641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27840 + ... + 63733.

It is an arithmetic number, because the mean of its divisors is an integer number (208513998).

Almost surely, 2^1643460631 is an apocalyptic number.

1643460631 is a deficient number, since it is larger than the sum of its proper divisors (24651353).

1643460631 is a wasteful number, since it uses less digits than its factorization.

1643460631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91841.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 1643460631 is about 40539.6180421079. The cubic root of 1643460631 is about 1180.1026031150.

The spelling of 1643460631 in words is "one billion, six hundred forty-three million, four hundred sixty thousand, six hundred thirty-one".