172355047481 has 4 divisors (see below), whose sum is σ = 172379610000. Its totient is φ = 172330484964.

The previous prime is 172355047477. The next prime is 172355047489. The reversal of 172355047481 is 184740553271.

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: 184740553271 = 757 ⋅244043003.

It is a cyclic number.

It is not a de Polignac number, because 172355047481 - 2² = 172355047477 is a prime.

It is a super-2 number, since 2×172355047481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172355047489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12270731 + ... + 12284768.

It is an arithmetic number, because the mean of its divisors is an integer number (43094902500).

Almost surely, 2^172355047481 is an apocalyptic number.

It is an amenable number.

172355047481 is a deficient number, since it is larger than the sum of its proper divisors (24562519).

172355047481 is an equidigital number, since it uses as much as digits as its factorization.

172355047481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24562518.

The product of its (nonzero) digits is 940800, while the sum is 47.

The spelling of 172355047481 in words is "one hundred seventy-two billion, three hundred fifty-five million, forty-seven thousand, four hundred eighty-one".