172050161 has 4 divisors (see below), whose sum is σ = 173823972. Its totient is φ = 170276352.

The previous prime is 172050139. The next prime is 172050211. The reversal of 172050161 is 161050271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161050271 = 1093 ⋅147347.

It can be written as a sum of positive squares in 2 ways, for example, as 70040161 + 102010000 = 8369^2 + 10100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172050161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172050101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 886760 + ... + 886953.

It is an arithmetic number, because the mean of its divisors is an integer number (43455993).

Almost surely, 2^172050161 is an apocalyptic number.

It is an amenable number.

172050161 is a deficient number, since it is larger than the sum of its proper divisors (1773811).

172050161 is an equidigital number, since it uses as much as digits as its factorization.

172050161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773810.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 172050161 is about 13116.7892793930. The cubic root of 172050161 is about 556.1838334629.

The spelling of 172050161 in words is "one hundred seventy-two million, fifty thousand, one hundred sixty-one".