49639669 has 2 divisors, whose sum is σ = 49639670. Its totient is φ = 49639668.

The previous prime is 49639663. The next prime is 49639687. The reversal of 49639669 is 96693694.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44395569 + 5244100 = 6663^2 + 2290^2 .

It is a cyclic number.

It is not a de Polignac number, because 49639669 - 2⁵ = 49639637 is a prime.

It is a super-2 number, since 2×49639669² = 4928193476859122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49639663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24819834 + 24819835.

It is an arithmetic number, because the mean of its divisors is an integer number (24819835).

Almost surely, 2^49639669 is an apocalyptic number.

It is an amenable number.

49639669 is a deficient number, since it is larger than the sum of its proper divisors (1).

49639669 is an equidigital number, since it uses as much as digits as its factorization.

49639669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 52.

The square root of 49639669 is about 7045.5424915332. The cubic root of 49639669 is about 367.5160349028.

The spelling of 49639669 in words is "forty-nine million, six hundred thirty-nine thousand, six hundred sixty-nine".