99261 has 12 divisors (see below), whose sum is σ = 147420. Its totient is φ = 64320.

The previous prime is 99259. The next prime is 99277. The reversal of 99261 is 16299.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5625 + 93636 = 75^2 + 306^2 .

It is not a de Polignac number, because 99261 - 2¹ = 99259 is a prime.

It is a super-2 number, since 2×99261² = 19705492242, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235 + ... + 503.

It is an arithmetic number, because the mean of its divisors is an integer number (12285).

2⁹⁹²⁶¹ is an apocalyptic number.

It is an amenable number.

99261 is a deficient number, since it is larger than the sum of its proper divisors (48159).

99261 is a wasteful number, since it uses less digits than its factorization.

99261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 313 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 99261 is about 315.0571376751. The cubic root of 99261 is about 46.3012677170.

Subtracting from 99261 its product of digits (972), we obtain a palindrome (98289).

The spelling of 99261 in words is "ninety-nine thousand, two hundred sixty-one".