181481479 has 2 divisors, whose sum is σ = 181481480. Its totient is φ = 181481478.

The previous prime is 181481459. The next prime is 181481513. The reversal of 181481479 is 974184181.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 181481479 - 2¹⁵ = 181448711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181481459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90740739 + 90740740.

It is an arithmetic number, because the mean of its divisors is an integer number (90740740).

Almost surely, 2^181481479 is an apocalyptic number.

181481479 is a deficient number, since it is larger than the sum of its proper divisors (1).

181481479 is an equidigital number, since it uses as much as digits as its factorization.

181481479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 43.

The square root of 181481479 is about 13471.5061889902. The cubic root of 181481479 is about 566.1664148335.

The spelling of 181481479 in words is "one hundred eighty-one million, four hundred eighty-one thousand, four hundred seventy-nine".