249161 has 4 divisors (see below), whose sum is σ = 271824. Its totient is φ = 226500.

The previous prime is 249143. The next prime is 249181. The reversal of 249161 is 161942.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 249161 - 2⁶ = 249097 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249161.

It is not an unprimeable number, because it can be changed into a prime (249131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11315 + ... + 11336.

It is an arithmetic number, because the mean of its divisors is an integer number (67956).

2²⁴⁹¹⁶¹ is an apocalyptic number.

It is an amenable number.

249161 is a deficient number, since it is larger than the sum of its proper divisors (22663).

249161 is a wasteful number, since it uses less digits than its factorization.

249161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22662.

The product of its digits is 432, while the sum is 23.

The square root of 249161 is about 499.1602948953. The cubic root of 249161 is about 62.9255019292.

It can be divided in two parts, 2491 and 61, that added together give a palindrome (2552).

The spelling of 249161 in words is "two hundred forty-nine thousand, one hundred sixty-one".