51057281 has 12 divisors (see below), whose sum is σ = 56298900. Its totient is φ = 46268640.

The previous prime is 51057269. The next prime is 51057287. The reversal of 51057281 is 18275015.

It can be written as a sum of positive squares in 2 ways, for example, as 35808256 + 15249025 = 5984^2 + 3905^2 .

It is not a de Polignac number, because 51057281 - 2¹⁸ = 50795137 is a prime.

It is a super-2 number, since 2×51057281² = 5213691886225922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51057287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61175 + ... + 62003.

It is an arithmetic number, because the mean of its divisors is an integer number (4691575).

Almost surely, 2^51057281 is an apocalyptic number.

It is an amenable number.

51057281 is a deficient number, since it is larger than the sum of its proper divisors (5241619).

51057281 is a wasteful number, since it uses less digits than its factorization.

51057281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360 (or 1349 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 51057281 is about 7145.4377752521. The cubic root of 51057281 is about 370.9817632582.

The spelling of 51057281 in words is "fifty-one million, fifty-seven thousand, two hundred eighty-one".