4977915581 has 2 divisors, whose sum is σ = 4977915582. Its totient is φ = 4977915580.

The previous prime is 4977915499. The next prime is 4977915601. The reversal of 4977915581 is 1855197794.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2898099556 + 2079816025 = 53834^2 + 45605^2 .

It is a cyclic number.

It is not a de Polignac number, because 4977915581 - 2¹⁴ = 4977899197 is a prime.

It is a super-2 number, since 2×4977915581² = 49559287063125135122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4977914581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2488957790 + 2488957791.

It is an arithmetic number, because the mean of its divisors is an integer number (2488957791).

Almost surely, 2^4977915581 is an apocalyptic number.

It is an amenable number.

4977915581 is a deficient number, since it is larger than the sum of its proper divisors (1).

4977915581 is an equidigital number, since it uses as much as digits as its factorization.

4977915581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3175200, while the sum is 56.

The square root of 4977915581 is about 70554.3448768394. The cubic root of 4977915581 is about 1707.4546425702.

The spelling of 4977915581 in words is "four billion, nine hundred seventy-seven million, nine hundred fifteen thousand, five hundred eighty-one".