49591021 has 4 divisors (see below), whose sum is σ = 49804092. Its totient is φ = 49377952.

The previous prime is 49591019. The next prime is 49591027. The reversal of 49591021 is 12019594.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12019594 = 2 ⋅6009797.

It can be written as a sum of positive squares in 2 ways, for example, as 24890121 + 24700900 = 4989^2 + 4970^2 .

It is a cyclic number.

It is not a de Polignac number, because 49591021 - 2¹ = 49591019 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49591027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106186 + ... + 106651.

It is an arithmetic number, because the mean of its divisors is an integer number (12451023).

Almost surely, 2^49591021 is an apocalyptic number.

It is an amenable number.

49591021 is a deficient number, since it is larger than the sum of its proper divisors (213071).

49591021 is a wasteful number, since it uses less digits than its factorization.

49591021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213070.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 49591021 is about 7042.0892496474. The cubic root of 49591021 is about 367.3959376487.

The spelling of 49591021 in words is "forty-nine million, five hundred ninety-one thousand, twenty-one".