252247661 has 8 divisors (see below), whose sum is σ = 254365464. Its totient is φ = 250136640.

The previous prime is 252247657. The next prime is 252247669. The reversal of 252247661 is 166742252.

It can be written as a sum of positive squares in 4 ways, for example, as 2418025 + 249829636 = 1555^2 + 15806^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 252247661 - 2² = 252247657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252247669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94931 + ... + 97551.

It is an arithmetic number, because the mean of its divisors is an integer number (31795683).

Almost surely, 2^252247661 is an apocalyptic number.

It is an amenable number.

252247661 is a deficient number, since it is larger than the sum of its proper divisors (2117803).

252247661 is a wasteful number, since it uses less digits than its factorization.

252247661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391.

The product of its digits is 40320, while the sum is 35.

The square root of 252247661 is about 15882.3065390390. The cubic root of 252247661 is about 631.8428121140.

The spelling of 252247661 in words is "two hundred fifty-two million, two hundred forty-seven thousand, six hundred sixty-one".