172561983289 has 2 divisors, whose sum is σ = 172561983290. Its totient is φ = 172561983288.

The previous prime is 172561983247. The next prime is 172561983311. The reversal of 172561983289 is 982389165271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156816000000 + 15745983289 = 396000^2 + 125483^2 .

It is a cyclic number.

It is not a de Polignac number, because 172561983289 - 2²⁵ = 172528428857 is a prime.

It is not a weakly prime, because it can be changed into another prime (172561983089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86280991644 + 86280991645.

It is an arithmetic number, because the mean of its divisors is an integer number (86280991645).

Almost surely, 2^172561983289 is an apocalyptic number.

It is an amenable number.

172561983289 is a deficient number, since it is larger than the sum of its proper divisors (1).

172561983289 is an equidigital number, since it uses as much as digits as its factorization.

172561983289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 61.

The spelling of 172561983289 in words is "one hundred seventy-two billion, five hundred sixty-one million, nine hundred eighty-three thousand, two hundred eighty-nine".