16431641 has 8 divisors (see below), whose sum is σ = 16727040. Its totient is φ = 16139088.

The previous prime is 16431617. The next prime is 16431659. The reversal of 16431641 is 14613461.

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 16431641 - 2¹⁴ = 16415257 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 16431641.

It is not an unprimeable number, because it can be changed into a prime (16430641) 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, 13250 + ... + 14436.

It is an arithmetic number, because the mean of its divisors is an integer number (2090880).

Almost surely, 2^16431641 is an apocalyptic number.

It is an amenable number.

16431641 is a deficient number, since it is larger than the sum of its proper divisors (295399).

16431641 is a wasteful number, since it uses less digits than its factorization.

16431641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423.

The product of its digits is 1728, while the sum is 26.

The square root of 16431641 is about 4053.5960578232. The cubic root of 16431641 is about 254.2301064372.

The spelling of 16431641 in words is "sixteen million, four hundred thirty-one thousand, six hundred forty-one".