13020172309 has 2 divisors, whose sum is σ = 13020172310. Its totient is φ = 13020172308.

The previous prime is 13020172283. The next prime is 13020172367. The reversal of 13020172309 is 90327102031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10771326225 + 2248846084 = 103785^2 + 47422^2 .

It is a cyclic number.

It is not a de Polignac number, because 13020172309 - 2¹³ = 13020164117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13020172379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6510086154 + 6510086155.

It is an arithmetic number, because the mean of its divisors is an integer number (6510086155).

Almost surely, 2^13020172309 is an apocalyptic number.

It is an amenable number.

13020172309 is a deficient number, since it is larger than the sum of its proper divisors (1).

13020172309 is an equidigital number, since it uses as much as digits as its factorization.

13020172309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

The spelling of 13020172309 in words is "thirteen billion, twenty million, one hundred seventy-two thousand, three hundred nine".