51494239 has 2 divisors, whose sum is σ = 51494240. Its totient is φ = 51494238.

The previous prime is 51494231. The next prime is 51494291. The reversal of 51494239 is 93249415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51494239 - 2³ = 51494231 is a prime.

It is a super-3 number, since 3×51494239³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51494198 and 51494207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51494231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25747119 + 25747120.

It is an arithmetic number, because the mean of its divisors is an integer number (25747120).

Almost surely, 2^51494239 is an apocalyptic number.

51494239 is a deficient number, since it is larger than the sum of its proper divisors (1).

51494239 is an equidigital number, since it uses as much as digits as its factorization.

51494239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 51494239 is about 7175.9486480883. The cubic root of 51494239 is about 372.0370694743.

The spelling of 51494239 in words is "fifty-one million, four hundred ninety-four thousand, two hundred thirty-nine".