181046431 has 2 divisors, whose sum is σ = 181046432. Its totient is φ = 181046430.

The previous prime is 181046429. The next prime is 181046441. The reversal of 181046431 is 134640181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 181046431 - 2¹ = 181046429 is a prime.

It is a super-2 number, since 2×181046431² = 65555620355675522, which contains 22 as substring.

Together with 181046429, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 181046431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181046401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90523215 + 90523216.

It is an arithmetic number, because the mean of its divisors is an integer number (90523216).

Almost surely, 2^181046431 is an apocalyptic number.

181046431 is a deficient number, since it is larger than the sum of its proper divisors (1).

181046431 is an equidigital number, since it uses as much as digits as its factorization.

181046431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 181046431 is about 13455.3495309486. The cubic root of 181046431 is about 565.7136475164.

The spelling of 181046431 in words is "one hundred eighty-one million, forty-six thousand, four hundred thirty-one".