172703681 has 4 divisors (see below), whose sum is σ = 172772292. Its totient is φ = 172635072.

The previous prime is 172703669. The next prime is 172703777. The reversal of 172703681 is 186307271.

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

It can be written as a sum of positive squares in 2 ways, for example, as 153264400 + 19439281 = 12380^2 + 4409^2 .

It is a cyclic number.

It is not a de Polignac number, because 172703681 - 2²² = 168509377 is a prime.

It is a super-2 number, since 2×172703681² = 59653122861899522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172703281) 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, 30380 + ... + 35613.

It is an arithmetic number, because the mean of its divisors is an integer number (43193073).

Almost surely, 2^172703681 is an apocalyptic number.

It is an amenable number.

172703681 is a deficient number, since it is larger than the sum of its proper divisors (68611).

172703681 is an equidigital number, since it uses as much as digits as its factorization.

172703681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68610.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 172703681 is about 13141.6772521623. The cubic root of 172703681 is about 556.8871516338.

The spelling of 172703681 in words is "one hundred seventy-two million, seven hundred three thousand, six hundred eighty-one".