172024661 has 2 divisors, whose sum is σ = 172024662. Its totient is φ = 172024660.

The previous prime is 172024603. The next prime is 172024667. The reversal of 172024661 is 166420271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117722500 + 54302161 = 10850^2 + 7369^2 .

It is a cyclic number.

It is not a de Polignac number, because 172024661 - 2²² = 167830357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172024667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86012330 + 86012331.

It is an arithmetic number, because the mean of its divisors is an integer number (86012331).

Almost surely, 2^172024661 is an apocalyptic number.

It is an amenable number.

172024661 is a deficient number, since it is larger than the sum of its proper divisors (1).

172024661 is an equidigital number, since it uses as much as digits as its factorization.

172024661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 172024661 is about 13115.8172067165. The cubic root of 172024661 is about 556.1563542897.

The spelling of 172024661 in words is "one hundred seventy-two million, twenty-four thousand, six hundred sixty-one".