8861531949 has 20 divisors (see below), whose sum is σ = 13240144764. Its totient is φ = 5906551104.

The previous prime is 8861531927. The next prime is 8861531953. The reversal of 8861531949 is 9491351688.

8861531949 is a `hidden beast` number, since 8 + 8 + 61 + 531 + 9 + 49 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3712464900 + 5149067049 = 60930^2 + 71757^2 .

It is a de Polignac number, because none of the positive numbers 2^k-8861531949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8861531895 and 8861531904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8861531909) 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, 750439 + ... + 762155.

Almost surely, 2^8861531949 is an apocalyptic number.

It is an amenable number.

8861531949 is a deficient number, since it is larger than the sum of its proper divisors (4378612815).

8861531949 is a wasteful number, since it uses less digits than its factorization.

8861531949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21066 (or 21057 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 8861531949 is about 94135.7102751129. The cubic root of 8861531949 is about 2069.3610441269.

The spelling of 8861531949 in words is "eight billion, eight hundred sixty-one million, five hundred thirty-one thousand, nine hundred forty-nine".