181869047 has 2 divisors, whose sum is σ = 181869048. Its totient is φ = 181869046.

The previous prime is 181869031. The next prime is 181869049. The reversal of 181869047 is 740968181.

It is a strong prime.

It is an emirp because it is prime and its reverse (740968181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181869047 - 2⁴ = 181869031 is a prime.

Together with 181869049, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 181868989 and 181869007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181869049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90934523 + 90934524.

It is an arithmetic number, because the mean of its divisors is an integer number (90934524).

Almost surely, 2^181869047 is an apocalyptic number.

181869047 is a deficient number, since it is larger than the sum of its proper divisors (1).

181869047 is an equidigital number, since it uses as much as digits as its factorization.

181869047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 181869047 is about 13485.8832487902. The cubic root of 181869047 is about 566.5691592704.

The spelling of 181869047 in words is "one hundred eighty-one million, eight hundred sixty-nine thousand, forty-seven".