49183781 has 4 divisors (see below), whose sum is σ = 49203372. Its totient is φ = 49164192.

The previous prime is 49183777. The next prime is 49183789. The reversal of 49183781 is 18738194.

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 8031556 + 41152225 = 2834^2 + 6415^2 .

It is a cyclic number.

It is not a de Polignac number, because 49183781 - 2² = 49183777 is a prime.

It is a super-2 number, since 2×49183781² = 4838088626911922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49183789) 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, 5360 + ... + 11273.

It is an arithmetic number, because the mean of its divisors is an integer number (12300843).

Almost surely, 2^49183781 is an apocalyptic number.

It is an amenable number.

49183781 is a deficient number, since it is larger than the sum of its proper divisors (19591).

49183781 is a wasteful number, since it uses less digits than its factorization.

49183781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19590.

The product of its digits is 48384, while the sum is 41.

The square root of 49183781 is about 7013.1149284751. The cubic root of 49183781 is about 366.3874906144.

The spelling of 49183781 in words is "forty-nine million, one hundred eighty-three thousand, seven hundred eighty-one".