51549493 has 2 divisors, whose sum is σ = 51549494. Its totient is φ = 51549492.

The previous prime is 51549439. The next prime is 51549499. The reversal of 51549493 is 39494515.

Together with previous prime (51549439) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49308484 + 2241009 = 7022^2 + 1497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51549493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51549499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25774746 + 25774747.

It is an arithmetic number, because the mean of its divisors is an integer number (25774747).

Almost surely, 2^51549493 is an apocalyptic number.

It is an amenable number.

51549493 is a deficient number, since it is larger than the sum of its proper divisors (1).

51549493 is an equidigital number, since it uses as much as digits as its factorization.

51549493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 40.

The square root of 51549493 is about 7179.7975598202. The cubic root of 51549493 is about 372.1700888084.

The spelling of 51549493 in words is "fifty-one million, five hundred forty-nine thousand, four hundred ninety-three".