51451811 has 2 divisors, whose sum is σ = 51451812. Its totient is φ = 51451810.

The previous prime is 51451781. The next prime is 51451849. The reversal of 51451811 is 11815415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51451811 - 2⁶ = 51451747 is a prime.

It is not a weakly prime, because it can be changed into another prime (51451861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25725905 + 25725906.

It is an arithmetic number, because the mean of its divisors is an integer number (25725906).

Almost surely, 2^51451811 is an apocalyptic number.

51451811 is a deficient number, since it is larger than the sum of its proper divisors (1).

51451811 is an equidigital number, since it uses as much as digits as its factorization.

51451811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 800, while the sum is 26.

The square root of 51451811 is about 7172.9917747060. The cubic root of 51451811 is about 371.9348630509.

It can be divided in two parts, 514 and 51811, that added together give a palindrome (52325).

The spelling of 51451811 in words is "fifty-one million, four hundred fifty-one thousand, eight hundred eleven".