252621307 has 4 divisors (see below), whose sum is σ = 252655456. Its totient is φ = 252587160.

The previous prime is 252621277. The next prime is 252621323. The reversal of 252621307 is 703126252.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252621307 is a prime.

It is a deceptive number, since it divides R_252621306.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252621107) 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, 819 + ... + 22492.

It is an arithmetic number, because the mean of its divisors is an integer number (63163864).

Almost surely, 2^252621307 is an apocalyptic number.

252621307 is a deficient number, since it is larger than the sum of its proper divisors (34149).

252621307 is a wasteful number, since it uses less digits than its factorization.

252621307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34148.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 252621307 is about 15894.0651502377. The cubic root of 252621307 is about 632.1546340562.

Adding to 252621307 its reverse (703126252), we get a palindrome (955747559).

It can be divided in two parts, 25262 and 1307, that added together give a square (26569 = 163²).

The spelling of 252621307 in words is "two hundred fifty-two million, six hundred twenty-one thousand, three hundred seven".