4979921 has 2 divisors, whose sum is σ = 4979922. Its totient is φ = 4979920.

The previous prime is 4979911. The next prime is 4979939. The reversal of 4979921 is 1299794.

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., 4682896 + 297025 = 2164^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 4979921 - 2¹⁸ = 4717777 is a prime.

It is a super-2 number, since 2×4979921² = 49599226332482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4979911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2489960 + 2489961.

It is an arithmetic number, because the mean of its divisors is an integer number (2489961).

Almost surely, 2^4979921 is an apocalyptic number.

It is an amenable number.

4979921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4979921 is an equidigital number, since it uses as much as digits as its factorization.

4979921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 4979921 is about 2231.5736599987. The cubic root of 4979921 is about 170.7683902000.

The spelling of 4979921 in words is "four million, nine hundred seventy-nine thousand, nine hundred twenty-one".