49517921 has 2 divisors, whose sum is σ = 49517922. Its totient is φ = 49517920.

The previous prime is 49517917. The next prime is 49517927. The reversal of 49517921 is 12971594.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37957921 + 11560000 = 6161^2 + 3400^2 .

It is a cyclic number.

It is not a de Polignac number, because 49517921 - 2² = 49517917 is a prime.

It is not a weakly prime, because it can be changed into another prime (49517927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24758960 + 24758961.

It is an arithmetic number, because the mean of its divisors is an integer number (24758961).

Almost surely, 2^49517921 is an apocalyptic number.

It is an amenable number.

49517921 is a deficient number, since it is larger than the sum of its proper divisors (1).

49517921 is an equidigital number, since it uses as much as digits as its factorization.

49517921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 38.

The square root of 49517921 is about 7036.8971144958. The cubic root of 49517921 is about 367.2153280047.

The spelling of 49517921 in words is "forty-nine million, five hundred seventeen thousand, nine hundred twenty-one".