51558811 has 2 divisors, whose sum is σ = 51558812. Its totient is φ = 51558810.

The previous prime is 51558779. The next prime is 51558833. The reversal of 51558811 is 11885515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51558811 - 2⁵ = 51558779 is a prime.

It is not a weakly prime, because it can be changed into another prime (51558211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25779405 + 25779406.

It is an arithmetic number, because the mean of its divisors is an integer number (25779406).

Almost surely, 2^51558811 is an apocalyptic number.

51558811 is a deficient number, since it is larger than the sum of its proper divisors (1).

51558811 is an equidigital number, since it uses as much as digits as its factorization.

51558811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8000, while the sum is 34.

The square root of 51558811 is about 7180.4464345889. The cubic root of 51558811 is about 372.1925117380.

The spelling of 51558811 in words is "fifty-one million, five hundred fifty-eight thousand, eight hundred eleven".