181249479 has 24 divisors (see below), whose sum is σ = 271252800. Its totient is φ = 116540160.

The previous prime is 181249477. The next prime is 181249487. The reversal of 181249479 is 974942181.

It is a happy number.

It is not a de Polignac number, because 181249479 - 2¹ = 181249477 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181249477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30082 + ... + 35600.

It is an arithmetic number, because the mean of its divisors is an integer number (11302200).

Almost surely, 2^181249479 is an apocalyptic number.

181249479 is a deficient number, since it is larger than the sum of its proper divisors (90003321).

181249479 is a wasteful number, since it uses less digits than its factorization.

181249479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5655 (or 5652 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 181249479 is about 13462.8926683681. The cubic root of 181249479 is about 565.9250557332.

The spelling of 181249479 in words is "one hundred eighty-one million, two hundred forty-nine thousand, four hundred seventy-nine".