49439917 has 2 divisors, whose sum is σ = 49439918. Its totient is φ = 49439916.

The previous prime is 49439879. The next prime is 49439921. The reversal of 49439917 is 71993494.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47734281 + 1705636 = 6909^2 + 1306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49439917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49439977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24719958 + 24719959.

It is an arithmetic number, because the mean of its divisors is an integer number (24719959).

Almost surely, 2^49439917 is an apocalyptic number.

It is an amenable number.

49439917 is a deficient number, since it is larger than the sum of its proper divisors (1).

49439917 is an equidigital number, since it uses as much as digits as its factorization.

49439917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 49439917 is about 7031.3524303650. The cubic root of 49439917 is about 367.0224058071.

The spelling of 49439917 in words is "forty-nine million, four hundred thirty-nine thousand, nine hundred seventeen".