49815181 has 4 divisors (see below), whose sum is σ = 53647132. Its totient is φ = 45983232.

The previous prime is 49815179. The next prime is 49815187. The reversal of 49815181 is 18151894.

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 17222500 + 32592681 = 4150^2 + 5709^2 .

It is a cyclic number.

It is not a de Polignac number, because 49815181 - 2¹ = 49815179 is a prime.

It is a super-2 number, since 2×49815181² = 4963104516125522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 49815181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49815187) 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, 1915956 + ... + 1915981.

It is an arithmetic number, because the mean of its divisors is an integer number (13411783).

Almost surely, 2^49815181 is an apocalyptic number.

It is an amenable number.

49815181 is a deficient number, since it is larger than the sum of its proper divisors (3831951).

49815181 is a wasteful number, since it uses less digits than its factorization.

49815181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3831950.

The product of its digits is 11520, while the sum is 37.

The square root of 49815181 is about 7057.9870359756. The cubic root of 49815181 is about 367.9486700815.

The spelling of 49815181 in words is "forty-nine million, eight hundred fifteen thousand, one hundred eighty-one".