48780821 has 2 divisors, whose sum is σ = 48780822. Its totient is φ = 48780820.

The previous prime is 48780793. The next prime is 48780859. The reversal of 48780821 is 12808784.

It is a happy number.

It is an a-pointer prime, because the next prime (48780859) can be obtained adding 48780821 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47458321 + 1322500 = 6889^2 + 1150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-48780821 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 (48780421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24390410 + 24390411.

It is an arithmetic number, because the mean of its divisors is an integer number (24390411).

Almost surely, 2^48780821 is an apocalyptic number.

It is an amenable number.

48780821 is a deficient number, since it is larger than the sum of its proper divisors (1).

48780821 is an equidigital number, since it uses as much as digits as its factorization.

48780821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 48780821 is about 6984.3268107957. The cubic root of 48780821 is about 365.3841480065.

The spelling of 48780821 in words is "forty-eight million, seven hundred eighty thousand, eight hundred twenty-one".