13172731 has 16 divisors (see below), whose sum is σ = 15579648. Its totient is φ = 10980000.

The previous prime is 13172729. The next prime is 13172791. The reversal of 13172731 is 13727131.

It is a cyclic number.

It is not a de Polignac number, because 13172731 - 2¹ = 13172729 is a prime.

It is a super-2 number, since 2×13172731² = 347041683996722, 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 = 13172696 and 13172705.

It is not an unprimeable number, because it can be changed into a prime (13172791) 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, 35710 + ... + 36076.

It is an arithmetic number, because the mean of its divisors is an integer number (973728).

Almost surely, 2^13172731 is an apocalyptic number.

13172731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13172731 is a deficient number, since it is larger than the sum of its proper divisors (2406917).

13172731 is a wasteful number, since it uses less digits than its factorization.

13172731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642.

The product of its digits is 882, while the sum is 25.

The square root of 13172731 is about 3629.4257121479. The cubic root of 13172731 is about 236.1702962659.

Adding to 13172731 its reverse (13727131), we get a palindrome (26899862).

The spelling of 13172731 in words is "thirteen million, one hundred seventy-two thousand, seven hundred thirty-one".