172390061138 has 4 divisors (see below), whose sum is σ = 258585091710. Its totient is φ = 86195030568.

The previous prime is 172390061101. The next prime is 172390061149. The reversal of 172390061138 is 831160093271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831160093271 = 42979 ⋅19338749.

It can be written as a sum of positive squares in only one way, i.e., 133961124049 + 38428937089 = 366007^2 + 196033^2 .

It is a junction number, because it is equal to n+sod(n) for n = 172390061095 and 172390061104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43097515283 + ... + 43097515286.

Almost surely, 2^172390061138 is an apocalyptic number.

172390061138 is a deficient number, since it is larger than the sum of its proper divisors (86195030572).

172390061138 is an equidigital number, since it uses as much as digits as its factorization.

172390061138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86195030571.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 172390061138 in words is "one hundred seventy-two billion, three hundred ninety million, sixty-one thousand, one hundred thirty-eight".