4989406981 has 8 divisors (see below), whose sum is σ = 5374061784. Its totient is φ = 4604874240.

The previous prime is 4989406979. The next prime is 4989407009. The reversal of 4989406981 is 1896049894.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 245025 + 4989161956 = 495^2 + 70634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4989406981 - 2¹ = 4989406979 is a prime.

It is a super-2 number, since 2×4989406981² = 49788364044103068722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4989406931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65625 + ... + 119521.

It is an arithmetic number, because the mean of its divisors is an integer number (671757723).

Almost surely, 2^4989406981 is an apocalyptic number.

It is an amenable number.

4989406981 is a deficient number, since it is larger than the sum of its proper divisors (384654803).

4989406981 is a wasteful number, since it uses less digits than its factorization.

4989406981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61031.

The product of its (nonzero) digits is 4478976, while the sum is 58.

The square root of 4989406981 is about 70635.7344479407. The cubic root of 4989406981 is about 1708.7675056924.

The spelling of 4989406981 in words is "four billion, nine hundred eighty-nine million, four hundred six thousand, nine hundred eighty-one".