51240253 has 2 divisors, whose sum is σ = 51240254. Its totient is φ = 51240252.

The previous prime is 51240221. The next prime is 51240307. The reversal of 51240253 is 35204215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27688644 + 23551609 = 5262^2 + 4853^2 .

It is a cyclic number.

It is not a de Polignac number, because 51240253 - 2⁵ = 51240221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51240953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25620126 + 25620127.

It is an arithmetic number, because the mean of its divisors is an integer number (25620127).

Almost surely, 2^51240253 is an apocalyptic number.

It is an amenable number.

51240253 is a deficient number, since it is larger than the sum of its proper divisors (1).

51240253 is an equidigital number, since it uses as much as digits as its factorization.

51240253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 51240253 is about 7158.2297392582. The cubic root of 51240253 is about 371.4243925918.

Adding to 51240253 its reverse (35204215), we get a palindrome (86444468).

The spelling of 51240253 in words is "fifty-one million, two hundred forty thousand, two hundred fifty-three".