1643040201 has 16 divisors (see below), whose sum is σ = 2430385920. Its totient is φ = 978903120.

The previous prime is 1643040199. The next prime is 1643040221. The reversal of 1643040201 is 1020403461.

It is not a de Polignac number, because 1643040201 - 2¹ = 1643040199 is a prime.

It is a super-2 number, since 2×1643040201² = 5399162204204240802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1643040221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 419995 + ... + 423888.

It is an arithmetic number, because the mean of its divisors is an integer number (151899120).

Almost surely, 2^1643040201 is an apocalyptic number.

1643040201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1643040201 is a deficient number, since it is larger than the sum of its proper divisors (787345719).

1643040201 is a wasteful number, since it uses less digits than its factorization.

1643040201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843956.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1643040201 is about 40534.4322891045. The cubic root of 1643040201 is about 1180.0019632736.

Adding to 1643040201 its reverse (1020403461), we get a palindrome (2663443662).

The spelling of 1643040201 in words is "one billion, six hundred forty-three million, forty thousand, two hundred one".