172189278013 has 2 divisors, whose sum is σ = 172189278014. Its totient is φ = 172189278012.

The previous prime is 172189277999. The next prime is 172189278047. The reversal of 172189278013 is 310872981271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167938498809 + 4250779204 = 409803^2 + 65198^2 .

It is a cyclic number.

It is not a de Polignac number, because 172189278013 - 2²¹ = 172187180861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172189278083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86094639006 + 86094639007.

It is an arithmetic number, because the mean of its divisors is an integer number (86094639007).

Almost surely, 2^172189278013 is an apocalyptic number.

It is an amenable number.

172189278013 is a deficient number, since it is larger than the sum of its proper divisors (1).

172189278013 is an equidigital number, since it uses as much as digits as its factorization.

172189278013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 49.

The spelling of 172189278013 in words is "one hundred seventy-two billion, one hundred eighty-nine million, two hundred seventy-eight thousand, thirteen".