4811553981 has 20 divisors (see below), whose sum is σ = 7740526332. Its totient is φ = 2960955648.

The previous prime is 4811553959. The next prime is 4811554019. The reversal of 4811553981 is 1893551184.

4811553981 is a `hidden beast` number, since 4 + 8 + 1 + 1 + 553 + 98 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 194351481 + 4617202500 = 13941^2 + 67950^2 .

It is not a de Polignac number, because 4811553981 - 2⁵ = 4811553949 is a prime.

It is a super-2 number, since 2×4811553981² = 46302103424153896722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4811553581) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2283636 + ... + 2285741.

Almost surely, 2^4811553981 is an apocalyptic number.

It is an amenable number.

4811553981 is a deficient number, since it is larger than the sum of its proper divisors (2928972351).

4811553981 is a wasteful number, since it uses less digits than its factorization.

4811553981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4569402 (or 4569393 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The square root of 4811553981 is about 69365.3658607810. The cubic root of 4811553981 is about 1688.2177189964.

The spelling of 4811553981 in words is "four billion, eight hundred eleven million, five hundred fifty-three thousand, nine hundred eighty-one".