16431961 has 16 divisors (see below), whose sum is σ = 20611584. Its totient is φ = 12752064.

The previous prime is 16431937. The next prime is 16431973. The reversal of 16431961 is 16913461.

It is not a de Polignac number, because 16431961 - 2⁹ = 16431449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16431901) 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, 3120 + ... + 6526.

It is an arithmetic number, because the mean of its divisors is an integer number (1288224).

Almost surely, 2^16431961 is an apocalyptic number.

It is an amenable number.

16431961 is a deficient number, since it is larger than the sum of its proper divisors (4179623).

16431961 is a wasteful number, since it uses less digits than its factorization.

16431961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480.

The product of its digits is 3888, while the sum is 31.

The square root of 16431961 is about 4053.6355287569. The cubic root of 16431961 is about 254.2317567715.

The spelling of 16431961 in words is "sixteen million, four hundred thirty-one thousand, nine hundred sixty-one".