51961111 has 2 divisors, whose sum is σ = 51961112. Its totient is φ = 51961110.

The previous prime is 51961109. The next prime is 51961121. The reversal of 51961111 is 11116915.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51961111 - 2¹ = 51961109 is a prime.

Together with 51961109, it forms a pair of twin primes.

It is equal to p_3111658 and since 51961111 and 3111658 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51961121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25980555 + 25980556.

It is an arithmetic number, because the mean of its divisors is an integer number (25980556).

Almost surely, 2^51961111 is an apocalyptic number.

51961111 is a deficient number, since it is larger than the sum of its proper divisors (1).

51961111 is an equidigital number, since it uses as much as digits as its factorization.

51961111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 25.

The square root of 51961111 is about 7208.4055795994. The cubic root of 51961111 is about 373.1580452801.

The spelling of 51961111 in words is "fifty-one million, nine hundred sixty-one thousand, one hundred eleven".