1643461201 has 4 divisors (see below), whose sum is σ = 1651720000. Its totient is φ = 1635202404.

The previous prime is 1643461147. The next prime is 1643461231. The reversal of 1643461201 is 1021643461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1021643461 = 15373 ⋅66457.

It is a cyclic number.

It is not a de Polignac number, because 1643461201 - 2¹⁵ = 1643428433 is a prime.

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 1643461201.

It is not an unprimeable number, because it can be changed into a prime (1643461231) 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, 4129101 + ... + 4129498.

It is an arithmetic number, because the mean of its divisors is an integer number (412930000).

Almost surely, 2^1643461201 is an apocalyptic number.

It is an amenable number.

1643461201 is a deficient number, since it is larger than the sum of its proper divisors (8258799).

1643461201 is an equidigital number, since it uses as much as digits as its factorization.

1643461201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8258798.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1643461201 is about 40539.6250722673. The cubic root of 1643461201 is about 1180.1027395463.

The spelling of 1643461201 in words is "one billion, six hundred forty-three million, four hundred sixty-one thousand, two hundred one".