49381781 has 2 divisors, whose sum is σ = 49381782. Its totient is φ = 49381780.

The previous prime is 49381771. The next prime is 49381811. The reversal of 49381781 is 18718394.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36493681 + 12888100 = 6041^2 + 3590^2 .

It is a cyclic number.

It is not a de Polignac number, because 49381781 - 2¹⁰ = 49380757 is a prime.

It is a super-2 number, since 2×49381781² = 4877120589463922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49381711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24690890 + 24690891.

It is an arithmetic number, because the mean of its divisors is an integer number (24690891).

Almost surely, 2^49381781 is an apocalyptic number.

It is an amenable number.

49381781 is a deficient number, since it is larger than the sum of its proper divisors (1).

49381781 is an equidigital number, since it uses as much as digits as its factorization.

49381781 is an evil number, because the sum of its binary digits is even.

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

The square root of 49381781 is about 7027.2171590182. The cubic root of 49381781 is about 366.8784898193.

The spelling of 49381781 in words is "forty-nine million, three hundred eighty-one thousand, seven hundred eighty-one".