172256547 has 4 divisors (see below), whose sum is σ = 229675400. Its totient is φ = 114837696.

The previous prime is 172256537. The next prime is 172256561. The reversal of 172256547 is 745652271.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 172256547 - 2¹⁴ = 172240163 is a prime.

It is a super-3 number, since 3×172256547³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172256537) 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, 28709422 + ... + 28709427.

It is an arithmetic number, because the mean of its divisors is an integer number (57418850).

Almost surely, 2^172256547 is an apocalyptic number.

172256547 is a deficient number, since it is larger than the sum of its proper divisors (57418853).

172256547 is an equidigital number, since it uses as much as digits as its factorization.

172256547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57418852.

The product of its digits is 117600, while the sum is 39.

The square root of 172256547 is about 13124.6541668724. The cubic root of 172256547 is about 556.4061381823.

The spelling of 172256547 in words is "one hundred seventy-two million, two hundred fifty-six thousand, five hundred forty-seven".