51323861 has 2 divisors, whose sum is σ = 51323862. Its totient is φ = 51323860.

The previous prime is 51323827. The next prime is 51323863. The reversal of 51323861 is 16832315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34880836 + 16443025 = 5906^2 + 4055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51323861 is a prime.

Together with 51323863, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_3075680 and since 51323861 and 3075680 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 (51323863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25661930 + 25661931.

It is an arithmetic number, because the mean of its divisors is an integer number (25661931).

Almost surely, 2^51323861 is an apocalyptic number.

It is an amenable number.

51323861 is a deficient number, since it is larger than the sum of its proper divisors (1).

51323861 is an equidigital number, since it uses as much as digits as its factorization.

51323861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 51323861 is about 7164.0673503255. The cubic root of 51323861 is about 371.6262988012.

The spelling of 51323861 in words is "fifty-one million, three hundred twenty-three thousand, eight hundred sixty-one".