49961815 has 4 divisors (see below), whose sum is σ = 59954184. Its totient is φ = 39969448.

The previous prime is 49961789. The next prime is 49961843. The reversal of 49961815 is 51816994.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51816994 = 2 ⋅25908497.

It is a cyclic number.

It is not a de Polignac number, because 49961815 - 2⁵ = 49961783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4996177 + ... + 4996186.

It is an arithmetic number, because the mean of its divisors is an integer number (14988546).

Almost surely, 2^49961815 is an apocalyptic number.

49961815 is a deficient number, since it is larger than the sum of its proper divisors (9992369).

49961815 is an equidigital number, since it uses as much as digits as its factorization.

49961815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9992368.

The product of its digits is 77760, while the sum is 43.

The square root of 49961815 is about 7068.3672089104. The cubic root of 49961815 is about 368.3093428180.

The spelling of 49961815 in words is "forty-nine million, nine hundred sixty-one thousand, eight hundred fifteen".