249979161 has 4 divisors (see below), whose sum is σ = 333305552. Its totient is φ = 166652772.

The previous prime is 249979153. The next prime is 249979193. The reversal of 249979161 is 161979942.

249979161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 249979161 - 2³ = 249979153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 249979161.

It is not an unprimeable number, because it can be changed into a prime (249979061) 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, 41663191 + ... + 41663196.

It is an arithmetic number, because the mean of its divisors is an integer number (83326388).

Almost surely, 2^249979161 is an apocalyptic number.

It is an amenable number.

249979161 is a deficient number, since it is larger than the sum of its proper divisors (83326391).

249979161 is an equidigital number, since it uses as much as digits as its factorization.

249979161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83326390.

The product of its digits is 244944, while the sum is 48.

The square root of 249979161 is about 15810.7293000671. The cubic root of 249979161 is about 629.9430207979.

The spelling of 249979161 in words is "two hundred forty-nine million, nine hundred seventy-nine thousand, one hundred sixty-one".