16431906969 has 15 divisors (see below), whose sum is σ = 24548152453. Its totient is φ = 10953835524.

The previous prime is 16431906901. The next prime is 16431906983. The reversal of 16431906969 is 96960913461.

The square root of 16431906969 is 128187.

It is a perfect power (a square), and thus also a powerful number.

16431906969 is a `hidden beast` number, since 1 + 6 + 431 + 90 + 69 + 69 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-16431906969 is a prime.

It is a super-2 number, since 2×16431906969² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16431902969) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1146562 + ... + 1160804.

Almost surely, 2^16431906969 is an apocalyptic number.

16431906969 is the 128187-th square number.

16431906969 is the 64094-th centered octagonal number.

It is an amenable number.

16431906969 is a deficient number, since it is larger than the sum of its proper divisors (8116245484).

16431906969 is an frugal number, since it uses more digits than its factorization.

16431906969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28498 (or 14246 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 54.

The spelling of 16431906969 in words is "sixteen billion, four hundred thirty-one million, nine hundred six thousand, nine hundred sixty-nine".