51849139 has 2 divisors, whose sum is σ = 51849140. Its totient is φ = 51849138.

The previous prime is 51849121. The next prime is 51849179. The reversal of 51849139 is 93194815.

It is an a-pointer prime, because the next prime (51849179) can be obtained adding 51849139 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51849139 - 2¹⁷ = 51718067 is a prime.

It is not a weakly prime, because it can be changed into another prime (51849179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25924569 + 25924570.

It is an arithmetic number, because the mean of its divisors is an integer number (25924570).

Almost surely, 2^51849139 is an apocalyptic number.

51849139 is a deficient number, since it is larger than the sum of its proper divisors (1).

51849139 is an equidigital number, since it uses as much as digits as its factorization.

51849139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 40.

The square root of 51849139 is about 7200.6346248091. The cubic root of 51849139 is about 372.8898106908.

The spelling of 51849139 in words is "fifty-one million, eight hundred forty-nine thousand, one hundred thirty-nine".