4919921 has 2 divisors, whose sum is σ = 4919922. Its totient is φ = 4919920.

The previous prime is 4919911. The next prime is 4919939. The reversal of 4919921 is 1299194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4669921 + 250000 = 2161^2 + 500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4919921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4919911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2459960 + 2459961.

It is an arithmetic number, because the mean of its divisors is an integer number (2459961).

Almost surely, 2^4919921 is an apocalyptic number.

It is an amenable number.

4919921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4919921 is an equidigital number, since it uses as much as digits as its factorization.

4919921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 35.

The square root of 4919921 is about 2218.0894932351. The cubic root of 4919921 is about 170.0797895345.

The spelling of 4919921 in words is "four million, nine hundred nineteen thousand, nine hundred twenty-one".