51487393 has 2 divisors, whose sum is σ = 51487394. Its totient is φ = 51487392.

The previous prime is 51487391. The next prime is 51487399. The reversal of 51487393 is 39378415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48553024 + 2934369 = 6968^2 + 1713^2 .

It is a cyclic number.

It is not a de Polignac number, because 51487393 - 2¹ = 51487391 is a prime.

Together with 51487391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51487391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25743696 + 25743697.

It is an arithmetic number, because the mean of its divisors is an integer number (25743697).

Almost surely, 2^51487393 is an apocalyptic number.

It is an amenable number.

51487393 is a deficient number, since it is larger than the sum of its proper divisors (1).

51487393 is an equidigital number, since it uses as much as digits as its factorization.

51487393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 51487393 is about 7175.4716221305. The cubic root of 51487393 is about 372.0205816839.

The spelling of 51487393 in words is "fifty-one million, four hundred eighty-seven thousand, three hundred ninety-three".