172852661 has 2 divisors, whose sum is σ = 172852662. Its totient is φ = 172852660.

The previous prime is 172852657. The next prime is 172852703. The reversal of 172852661 is 166258271.

172852661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100500625 + 72352036 = 10025^2 + 8506^2 .

It is an emirp because it is prime and its reverse (166258271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172852661 - 2² = 172852657 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 (172852261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86426330 + 86426331.

It is an arithmetic number, because the mean of its divisors is an integer number (86426331).

Almost surely, 2^172852661 is an apocalyptic number.

It is an amenable number.

172852661 is a deficient number, since it is larger than the sum of its proper divisors (1).

172852661 is an equidigital number, since it uses as much as digits as its factorization.

172852661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 172852661 is about 13147.3442565409. The cubic root of 172852661 is about 557.0472354695.

The spelling of 172852661 in words is "one hundred seventy-two million, eight hundred fifty-two thousand, six hundred sixty-one".