4987921 has 2 divisors, whose sum is σ = 4987922. Its totient is φ = 4987920.

The previous prime is 4987907. The next prime is 4987943. The reversal of 4987921 is 1297894.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4579600 + 408321 = 2140^2 + 639^2 .

It is a cyclic number.

It is not a de Polignac number, because 4987921 - 2⁵ = 4987889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4987901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2493960 + 2493961.

It is an arithmetic number, because the mean of its divisors is an integer number (2493961).

Almost surely, 2^4987921 is an apocalyptic number.

It is an amenable number.

4987921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4987921 is an equidigital number, since it uses as much as digits as its factorization.

4987921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 4987921 is about 2233.3653977798. The cubic root of 4987921 is about 170.8597849714.

The spelling of 4987921 in words is "four million, nine hundred eighty-seven thousand, nine hundred twenty-one".