172079689 has 2 divisors, whose sum is σ = 172079690. Its totient is φ = 172079688.

The previous prime is 172079683. The next prime is 172079723. The reversal of 172079689 is 986970271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132641289 + 39438400 = 11517^2 + 6280^2 .

It is a cyclic number.

It is not a de Polignac number, because 172079689 - 2²¹ = 169982537 is a prime.

It is a super-2 number, since 2×172079689² = 59222838732673442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172079683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86039844 + 86039845.

It is an arithmetic number, because the mean of its divisors is an integer number (86039845).

Almost surely, 2^172079689 is an apocalyptic number.

It is an amenable number.

172079689 is a deficient number, since it is larger than the sum of its proper divisors (1).

172079689 is an equidigital number, since it uses as much as digits as its factorization.

172079689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 172079689 is about 13117.9148114325. The cubic root of 172079689 is about 556.2156498756.

It can be divided in two parts, 17207 and 9689, that added together give a square (26896 = 164²).

The spelling of 172079689 in words is "one hundred seventy-two million, seventy-nine thousand, six hundred eighty-nine".