51466139 has 2 divisors, whose sum is σ = 51466140. Its totient is φ = 51466138.

The previous prime is 51466133. The next prime is 51466187. The reversal of 51466139 is 93166415.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51466139 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 51466099 and 51466108.

It is not a weakly prime, because it can be changed into another prime (51466133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25733069 + 25733070.

It is an arithmetic number, because the mean of its divisors is an integer number (25733070).

Almost surely, 2^51466139 is an apocalyptic number.

51466139 is a deficient number, since it is larger than the sum of its proper divisors (1).

51466139 is an equidigital number, since it uses as much as digits as its factorization.

51466139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 51466139 is about 7173.9904516245. The cubic root of 51466139 is about 371.9693845965.

The spelling of 51466139 in words is "fifty-one million, four hundred sixty-six thousand, one hundred thirty-nine".