4921780489 has 2 divisors, whose sum is σ = 4921780490. Its totient is φ = 4921780488.

The previous prime is 4921780481. The next prime is 4921780519. The reversal of 4921780489 is 9840871294.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4446889225 + 474891264 = 66685^2 + 21792^2 .

It is a cyclic number.

It is not a de Polignac number, because 4921780489 - 2³ = 4921780481 is a prime.

It is not a weakly prime, because it can be changed into another prime (4921780481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2460890244 + 2460890245.

It is an arithmetic number, because the mean of its divisors is an integer number (2460890245).

Almost surely, 2^4921780489 is an apocalyptic number.

It is an amenable number.

4921780489 is a deficient number, since it is larger than the sum of its proper divisors (1).

4921780489 is an equidigital number, since it uses as much as digits as its factorization.

4921780489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 4921780489 is about 70155.4024220516. The cubic root of 4921780489 is about 1701.0121411040.

The spelling of 4921780489 in words is "four billion, nine hundred twenty-one million, seven hundred eighty thousand, four hundred eighty-nine".