249999161 has 6 divisors (see below), whose sum is σ = 265570350. Its totient is φ = 235293056.

The previous prime is 249999149. The next prime is 249999193. The reversal of 249999161 is 161999942.

It can be written as a sum of positive squares in 3 ways, for example, as 128029225 + 121969936 = 11315^2 + 11044^2 .

It is not a de Polignac number, because 249999161 - 2¹⁸ = 249737017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249999661) 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, 432236 + ... + 432813.

It is an arithmetic number, because the mean of its divisors is an integer number (44261725).

Almost surely, 2^249999161 is an apocalyptic number.

It is an amenable number.

249999161 is a deficient number, since it is larger than the sum of its proper divisors (15571189).

249999161 is an equidigital number, since it uses as much as digits as its factorization.

249999161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865083 (or 865066 counting only the distinct ones).

The product of its digits is 314928, while the sum is 50.

The square root of 249999161 is about 15811.3617693101. The cubic root of 249999161 is about 629.9598202308.

It can be divided in two parts, 2499991 and 61, that added together give a palindrome (2500052).

The spelling of 249999161 in words is "two hundred forty-nine million, nine hundred ninety-nine thousand, one hundred sixty-one".