181834421 has 2 divisors, whose sum is σ = 181834422. Its totient is φ = 181834420.

The previous prime is 181834369. The next prime is 181834451. The reversal of 181834421 is 124438181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141372100 + 40462321 = 11890^2 + 6361^2 .

It is a cyclic number.

It is not a de Polignac number, because 181834421 - 2²² = 177640117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181834451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90917210 + 90917211.

It is an arithmetic number, because the mean of its divisors is an integer number (90917211).

Almost surely, 2^181834421 is an apocalyptic number.

It is an amenable number.

181834421 is a deficient number, since it is larger than the sum of its proper divisors (1).

181834421 is an equidigital number, since it uses as much as digits as its factorization.

181834421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 32.

The square root of 181834421 is about 13484.5994007979. The cubic root of 181834421 is about 566.5332006705.

The spelling of 181834421 in words is "one hundred eighty-one million, eight hundred thirty-four thousand, four hundred twenty-one".