49615813 has 4 divisors (see below), whose sum is σ = 53432428. Its totient is φ = 45799200.

The previous prime is 49615777. The next prime is 49615817. The reversal of 49615813 is 31851694.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5963364 + 43652449 = 2442^2 + 6607^2 .

It is a cyclic number.

It is not a de Polignac number, because 49615813 - 2¹⁷ = 49484741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49615817) 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, 1908288 + ... + 1908313.

It is an arithmetic number, because the mean of its divisors is an integer number (13358107).

Almost surely, 2^49615813 is an apocalyptic number.

It is an amenable number.

49615813 is a deficient number, since it is larger than the sum of its proper divisors (3816615).

49615813 is a wasteful number, since it uses less digits than its factorization.

49615813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3816614.

The product of its digits is 25920, while the sum is 37.

The square root of 49615813 is about 7043.8493027605. The cubic root of 49615813 is about 367.4571514360.

The spelling of 49615813 in words is "forty-nine million, six hundred fifteen thousand, eight hundred thirteen".