172220557 has 8 divisors (see below), whose sum is σ = 182865600. Its totient is φ = 161632704.

The previous prime is 172220539. The next prime is 172220563. The reversal of 172220557 is 755022271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172220557 - 2¹¹ = 172218509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172220537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8007 + ... + 20212.

It is an arithmetic number, because the mean of its divisors is an integer number (22858200).

Almost surely, 2^172220557 is an apocalyptic number.

172220557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

172220557 is a deficient number, since it is larger than the sum of its proper divisors (10645043).

172220557 is a wasteful number, since it uses less digits than its factorization.

172220557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28595.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 172220557 is about 13123.2830115029. The cubic root of 172220557 is about 556.3673850317.

The spelling of 172220557 in words is "one hundred seventy-two million, two hundred twenty thousand, five hundred fifty-seven".