51779281 has 2 divisors, whose sum is σ = 51779282. Its totient is φ = 51779280.

The previous prime is 51779261. The next prime is 51779291. The reversal of 51779281 is 18297715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38638656 + 13140625 = 6216^2 + 3625^2 .

It is a cyclic number.

It is not a de Polignac number, because 51779281 - 2¹¹ = 51777233 is a prime.

It is a super-2 number, since 2×51779281² = 5362187881753922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51779261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25889640 + 25889641.

It is an arithmetic number, because the mean of its divisors is an integer number (25889641).

Almost surely, 2^51779281 is an apocalyptic number.

It is an amenable number.

51779281 is a deficient number, since it is larger than the sum of its proper divisors (1).

51779281 is an equidigital number, since it uses as much as digits as its factorization.

51779281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 40.

The square root of 51779281 is about 7195.7821673533. The cubic root of 51779281 is about 372.7222666409.

The spelling of 51779281 in words is "fifty-one million, seven hundred seventy-nine thousand, two hundred eighty-one".