51494189 has 2 divisors, whose sum is σ = 51494190. Its totient is φ = 51494188.

The previous prime is 51494167. The next prime is 51494231. The reversal of 51494189 is 98149415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41822089 + 9672100 = 6467^2 + 3110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51494189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51494119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25747094 + 25747095.

It is an arithmetic number, because the mean of its divisors is an integer number (25747095).

Almost surely, 2^51494189 is an apocalyptic number.

It is an amenable number.

51494189 is a deficient number, since it is larger than the sum of its proper divisors (1).

51494189 is an equidigital number, since it uses as much as digits as its factorization.

51494189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 51494189 is about 7175.9451642275. The cubic root of 51494189 is about 372.0369490605.

The spelling of 51494189 in words is "fifty-one million, four hundred ninety-four thousand, one hundred eighty-nine".