51435257 has 2 divisors, whose sum is σ = 51435258. Its totient is φ = 51435256.

The previous prime is 51435253. The next prime is 51435269. The reversal of 51435257 is 75253415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49857721 + 1577536 = 7061^2 + 1256^2 .

It is a cyclic number.

It is not a de Polignac number, because 51435257 - 2² = 51435253 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51435253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25717628 + 25717629.

It is an arithmetic number, because the mean of its divisors is an integer number (25717629).

Almost surely, 2^51435257 is an apocalyptic number.

It is an amenable number.

51435257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51435257 is an equidigital number, since it uses as much as digits as its factorization.

51435257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 32.

The square root of 51435257 is about 7171.8377700559. The cubic root of 51435257 is about 371.8949702525.

The spelling of 51435257 in words is "fifty-one million, four hundred thirty-five thousand, two hundred fifty-seven".