181440049 has 4 divisors (see below), whose sum is σ = 207360064. Its totient is φ = 155520036.

The previous prime is 181440043. The next prime is 181440053. The reversal of 181440049 is 940044181.

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, and also an emirpimes, since its reverse is a distinct semiprime: 940044181 = 919 ⋅1022899.

It is not a de Polignac number, because 181440049 - 2¹³ = 181431857 is a prime.

It is a super-2 number, since 2×181440049² = 65840982762244802, which contains 22 as substring.

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 181440049.

It is not an unprimeable number, because it can be changed into a prime (181440043) 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, 12959997 + ... + 12960010.

It is an arithmetic number, because the mean of its divisors is an integer number (51840016).

Almost surely, 2^181440049 is an apocalyptic number.

It is an amenable number.

181440049 is a deficient number, since it is larger than the sum of its proper divisors (25920015).

181440049 is an equidigital number, since it uses as much as digits as its factorization.

181440049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25920014.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 181440049 is about 13469.9684112473. The cubic root of 181440049 is about 566.1233286007.

The spelling of 181440049 in words is "one hundred eighty-one million, four hundred forty thousand, forty-nine".