172245557 has 12 divisors (see below), whose sum is σ = 190192128. Its totient is φ = 155872200.

The previous prime is 172245539. The next prime is 172245589. The reversal of 172245557 is 755542271.

It is a de Polignac number, because none of the positive numbers 2^k-172245557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172245557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172245257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24332 + ... + 30602.

It is an arithmetic number, because the mean of its divisors is an integer number (15849344).

Almost surely, 2^172245557 is an apocalyptic number.

It is an amenable number.

172245557 is a deficient number, since it is larger than the sum of its proper divisors (17946571).

172245557 is a wasteful number, since it uses less digits than its factorization.

172245557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6520 (or 6509 counting only the distinct ones).

The product of its digits is 98000, while the sum is 38.

The square root of 172245557 is about 13124.2354824957. The cubic root of 172245557 is about 556.3943049920.

The spelling of 172245557 in words is "one hundred seventy-two million, two hundred forty-five thousand, five hundred fifty-seven".