172369081 has 2 divisors, whose sum is σ = 172369082. Its totient is φ = 172369080.

The previous prime is 172369049. The next prime is 172369111. The reversal of 172369081 is 180963271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166823056 + 5546025 = 12916^2 + 2355^2 .

It is a cyclic number.

It is not a de Polignac number, because 172369081 - 2⁵ = 172369049 is a prime.

It is a super-2 number, since 2×172369081² = 59422200169569122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 172369081.

It is not a weakly prime, because it can be changed into another prime (172361081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86184540 + 86184541.

It is an arithmetic number, because the mean of its divisors is an integer number (86184541).

Almost surely, 2^172369081 is an apocalyptic number.

It is an amenable number.

172369081 is a deficient number, since it is larger than the sum of its proper divisors (1).

172369081 is an equidigital number, since it uses as much as digits as its factorization.

172369081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 172369081 is about 13128.9405894002. The cubic root of 172369081 is about 556.5272772220.

The spelling of 172369081 in words is "one hundred seventy-two million, three hundred sixty-nine thousand, eighty-one".