52561251 has 8 divisors (see below), whose sum is σ = 77868560. Its totient is φ = 35040816.

The previous prime is 52561247. The next prime is 52561343. The reversal of 52561251 is 15216525.

52561251 is a `hidden beast` number, since 52 + 561 + 2 + 51 = 666.

It is not a de Polignac number, because 52561251 - 2² = 52561247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1946713 = 52561251 / (5 + 2 + 5 + 6 + 1 + 2 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52561211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 973330 + ... + 973383.

It is an arithmetic number, because the mean of its divisors is an integer number (9733570).

Almost surely, 2^52561251 is an apocalyptic number.

52561251 is a deficient number, since it is larger than the sum of its proper divisors (25307309).

52561251 is a wasteful number, since it uses less digits than its factorization.

52561251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946722 (or 1946716 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 52561251 is about 7249.9138615573. The cubic root of 52561251 is about 374.5891821074.

Adding to 52561251 its reverse (15216525), we get a palindrome (67777776).

It can be divided in two parts, 525 and 61251, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 52561251 in words is "fifty-two million, five hundred sixty-one thousand, two hundred fifty-one".