51813911 has 2 divisors, whose sum is σ = 51813912. Its totient is φ = 51813910.

The previous prime is 51813899. The next prime is 51813929. The reversal of 51813911 is 11931815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51813911 - 2¹⁴ = 51797527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51813941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25906955 + 25906956.

It is an arithmetic number, because the mean of its divisors is an integer number (25906956).

Almost surely, 2^51813911 is an apocalyptic number.

51813911 is a deficient number, since it is larger than the sum of its proper divisors (1).

51813911 is an equidigital number, since it uses as much as digits as its factorization.

51813911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 29.

The square root of 51813911 is about 7198.1880358879. The cubic root of 51813911 is about 372.8053403815.

The spelling of 51813911 in words is "fifty-one million, eight hundred thirteen thousand, nine hundred eleven".