172620061 has 4 divisors (see below), whose sum is σ = 172648672. Its totient is φ = 172591452.

The previous prime is 172620053. The next prime is 172620079. The reversal of 172620061 is 160026271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 160026271 = 79 ⋅2025649.

It is a cyclic number.

It is not a de Polignac number, because 172620061 - 2³ = 172620053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172620001) 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, 1335 + ... + 18628.

It is an arithmetic number, because the mean of its divisors is an integer number (43162168).

Almost surely, 2^172620061 is an apocalyptic number.

It is an amenable number.

172620061 is a deficient number, since it is larger than the sum of its proper divisors (28611).

172620061 is an equidigital number, since it uses as much as digits as its factorization.

172620061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28610.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 172620061 is about 13138.4953856977. The cubic root of 172620061 is about 556.7972588938.

The spelling of 172620061 in words is "one hundred seventy-two million, six hundred twenty thousand, sixty-one".