16431001 has 4 divisors (see below), whose sum is σ = 16491904. Its totient is φ = 16370100.

The previous prime is 16430989. The next prime is 16431017. The reversal of 16431001 is 10013461.

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.

It is a cyclic number.

It is not a de Polignac number, because 16431001 - 2⁹ = 16430489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16431101) 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, 30045 + ... + 30586.

It is an arithmetic number, because the mean of its divisors is an integer number (4122976).

Almost surely, 2^16431001 is an apocalyptic number.

It is an amenable number.

16431001 is a deficient number, since it is larger than the sum of its proper divisors (60903).

16431001 is an equidigital number, since it uses as much as digits as its factorization.

16431001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60902.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 16431001 is about 4053.5171148029. The cubic root of 16431001 is about 254.2268057041.

Adding to 16431001 its reverse (10013461), we get a palindrome (26444462).

The spelling of 16431001 in words is "sixteen million, four hundred thirty-one thousand, one".