49185738821 has 2 divisors, whose sum is σ = 49185738822. Its totient is φ = 49185738820.

The previous prime is 49185738799. The next prime is 49185738827. The reversal of 49185738821 is 12883758194.

49185738821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43126828900 + 6058909921 = 207670^2 + 77839^2 .

It is a cyclic number.

It is not a de Polignac number, because 49185738821 - 2¹⁴ = 49185722437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49185738827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24592869410 + 24592869411.

It is an arithmetic number, because the mean of its divisors is an integer number (24592869411).

Almost surely, 2^49185738821 is an apocalyptic number.

It is an amenable number.

49185738821 is a deficient number, since it is larger than the sum of its proper divisors (1).

49185738821 is an equidigital number, since it uses as much as digits as its factorization.

49185738821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3870720, while the sum is 56.

The spelling of 49185738821 in words is "forty-nine billion, one hundred eighty-five million, seven hundred thirty-eight thousand, eight hundred twenty-one".