51501257 has 2 divisors, whose sum is σ = 51501258. Its totient is φ = 51501256.

The previous prime is 51501253. The next prime is 51501259. The reversal of 51501257 is 75210515.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33362176 + 18139081 = 5776^2 + 4259^2 .

It is a cyclic number.

It is not a de Polignac number, because 51501257 - 2² = 51501253 is a prime.

Together with 51501259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51501253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25750628 + 25750629.

It is an arithmetic number, because the mean of its divisors is an integer number (25750629).

Almost surely, 2^51501257 is an apocalyptic number.

It is an amenable number.

51501257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51501257 is an equidigital number, since it uses as much as digits as its factorization.

51501257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 51501257 is about 7176.4376260092. The cubic root of 51501257 is about 372.0539699898.

The spelling of 51501257 in words is "fifty-one million, five hundred one thousand, two hundred fifty-seven".