252172621 has 4 divisors (see below), whose sum is σ = 263136672. Its totient is φ = 241208572.

The previous prime is 252172619. The next prime is 252172643. The reversal of 252172621 is 126271252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 252172621 - 2¹ = 252172619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 252172621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252172691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5481991 + ... + 5482036.

It is an arithmetic number, because the mean of its divisors is an integer number (65784168).

Almost surely, 2^252172621 is an apocalyptic number.

It is an amenable number.

252172621 is a deficient number, since it is larger than the sum of its proper divisors (10964051).

252172621 is a wasteful number, since it uses less digits than its factorization.

252172621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10964050.

The product of its digits is 3360, while the sum is 28.

The square root of 252172621 is about 15879.9439860473. The cubic root of 252172621 is about 631.7801512264.

The spelling of 252172621 in words is "two hundred fifty-two million, one hundred seventy-two thousand, six hundred twenty-one".