49139687 has 2 divisors, whose sum is σ = 49139688. Its totient is φ = 49139686.

The previous prime is 49139683. The next prime is 49139723. The reversal of 49139687 is 78693194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 49139687 - 2² = 49139683 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49139683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24569843 + 24569844.

It is an arithmetic number, because the mean of its divisors is an integer number (24569844).

Almost surely, 2^49139687 is an apocalyptic number.

49139687 is a deficient number, since it is larger than the sum of its proper divisors (1).

49139687 is an equidigital number, since it uses as much as digits as its factorization.

49139687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 49139687 is about 7009.9705420208. The cubic root of 49139687 is about 366.2779672447.

The spelling of 49139687 in words is "forty-nine million, one hundred thirty-nine thousand, six hundred eighty-seven".