16172431 has 8 divisors (see below), whose sum is σ = 17942400. Its totient is φ = 14452440.

The previous prime is 16172417. The next prime is 16172449. The reversal of 16172431 is 13427161.

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 16172431 - 2¹⁷ = 16041359 is a prime.

It is a super-2 number, since 2×16172431² = 523095048899522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16172396 and 16172405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16172461) 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, 11811 + ... + 13108.

It is an arithmetic number, because the mean of its divisors is an integer number (2242800).

Almost surely, 2^16172431 is an apocalyptic number.

16172431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16172431 is a deficient number, since it is larger than the sum of its proper divisors (1769969).

16172431 is a wasteful number, since it uses less digits than its factorization.

16172431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24989.

The product of its digits is 1008, while the sum is 25.

The square root of 16172431 is about 4021.4961146320. The cubic root of 16172431 is about 252.8861835536.

Adding to 16172431 its reverse (13427161), we get a palindrome (29599592).

The spelling of 16172431 in words is "sixteen million, one hundred seventy-two thousand, four hundred thirty-one".