51740251 has 2 divisors, whose sum is σ = 51740252. Its totient is φ = 51740250.

The previous prime is 51740233. The next prime is 51740303. The reversal of 51740251 is 15204715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51740251 - 2⁷ = 51740123 is a prime.

It is not a weakly prime, because it can be changed into another prime (51740551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25870125 + 25870126.

It is an arithmetic number, because the mean of its divisors is an integer number (25870126).

Almost surely, 2^51740251 is an apocalyptic number.

51740251 is a deficient number, since it is larger than the sum of its proper divisors (1).

51740251 is an equidigital number, since it uses as much as digits as its factorization.

51740251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 51740251 is about 7193.0696507124. The cubic root of 51740251 is about 372.6285933513.

Adding to 51740251 its reverse (15204715), we get a palindrome (66944966).

The spelling of 51740251 in words is "fifty-one million, seven hundred forty thousand, two hundred fifty-one".