4978924121 has 2 divisors, whose sum is σ = 4978924122. Its totient is φ = 4978924120.

The previous prime is 4978924117. The next prime is 4978924133. The reversal of 4978924121 is 1214298794.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2492505625 + 2486418496 = 49925^2 + 49864^2 .

It is a cyclic number.

It is not a de Polignac number, because 4978924121 - 2² = 4978924117 is a prime.

It is not a weakly prime, because it can be changed into another prime (4978923121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2489462060 + 2489462061.

It is an arithmetic number, because the mean of its divisors is an integer number (2489462061).

Almost surely, 2^4978924121 is an apocalyptic number.

It is an amenable number.

4978924121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4978924121 is an equidigital number, since it uses as much as digits as its factorization.

4978924121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 4978924121 is about 70561.4917713621. The cubic root of 4978924121 is about 1707.5699465225.

The spelling of 4978924121 in words is "four billion, nine hundred seventy-eight million, nine hundred twenty-four thousand, one hundred twenty-one".