13020172331 has 8 divisors (see below), whose sum is σ = 13044245760. Its totient is φ = 12996117288.

The previous prime is 13020172309. The next prime is 13020172367. The reversal of 13020172331 is 13327102031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13020172331 is a prime.

It is a super-2 number, since 2×13020172331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13020172297 and 13020172306.

It is not an unprimeable number, because it can be changed into a prime (13020172031) 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, 3006890 + ... + 3011216.

It is an arithmetic number, because the mean of its divisors is an integer number (1630530720).

Almost surely, 2^13020172331 is an apocalyptic number.

13020172331 is a deficient number, since it is larger than the sum of its proper divisors (24073429).

13020172331 is an equidigital number, since it uses as much as digits as its factorization.

13020172331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9193.

The product of its (nonzero) digits is 756, while the sum is 23.

Adding to 13020172331 its reverse (13327102031), we get a palindrome (26347274362).

The spelling of 13020172331 in words is "thirteen billion, twenty million, one hundred seventy-two thousand, three hundred thirty-one".