8991261 has 6 divisors (see below), whose sum is σ = 12987390. Its totient is φ = 5994168.

The previous prime is 8991253. The next prime is 8991289. The reversal of 8991261 is 1621998.

It can be written as a sum of positive squares in only one way, i.e., 8964036 + 27225 = 2994^2 + 165^2 .

It is not a de Polignac number, because 8991261 - 2³ = 8991253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8991251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 499506 + ... + 499523.

It is an arithmetic number, because the mean of its divisors is an integer number (2164565).

Almost surely, 2^8991261 is an apocalyptic number.

It is an amenable number.

8991261 is a deficient number, since it is larger than the sum of its proper divisors (3996129).

8991261 is a wasteful number, since it uses less digits than its factorization.

8991261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999035 (or 999032 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 8991261 is about 2998.5431462629. The cubic root of 8991261 is about 207.9410351227.

The spelling of 8991261 in words is "eight million, nine hundred ninety-one thousand, two hundred sixty-one".