51811811 has 2 divisors, whose sum is σ = 51811812. Its totient is φ = 51811810.

The previous prime is 51811787. The next prime is 51811817. The reversal of 51811811 is 11811815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51811811 - 2¹⁴ = 51795427 is a prime.

It is not a weakly prime, because it can be changed into another prime (51811817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25905905 + 25905906.

It is an arithmetic number, because the mean of its divisors is an integer number (25905906).

Almost surely, 2^51811811 is an apocalyptic number.

51811811 is a deficient number, since it is larger than the sum of its proper divisors (1).

51811811 is an equidigital number, since it uses as much as digits as its factorization.

51811811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 26.

The square root of 51811811 is about 7198.0421643666. The cubic root of 51811811 is about 372.8003037560.

The spelling of 51811811 in words is "fifty-one million, eight hundred eleven thousand, eight hundred eleven".