181429121 has 2 divisors, whose sum is σ = 181429122. Its totient is φ = 181429120.

The previous prime is 181429103. The next prime is 181429139. The reversal of 181429121 is 121924181.

It is a balanced prime because it is at equal distance from previous prime (181429103) and next prime (181429139).

It can be written as a sum of positive squares in only one way, i.e., 147962896 + 33466225 = 12164^2 + 5785^2 .

It is a cyclic number.

It is not a de Polignac number, because 181429121 - 2²² = 177234817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181479121) 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, 90714560 + 90714561.

It is an arithmetic number, because the mean of its divisors is an integer number (90714561).

Almost surely, 2^181429121 is an apocalyptic number.

It is an amenable number.

181429121 is a deficient number, since it is larger than the sum of its proper divisors (1).

181429121 is an equidigital number, since it uses as much as digits as its factorization.

181429121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 29.

The square root of 181429121 is about 13469.5627620202. The cubic root of 181429121 is about 566.1119626427. Note that the first 3 decimals are identical.

The spelling of 181429121 in words is "one hundred eighty-one million, four hundred twenty-nine thousand, one hundred twenty-one".