181421743 has 2 divisors, whose sum is σ = 181421744. Its totient is φ = 181421742.

The previous prime is 181421699. The next prime is 181421759. The reversal of 181421743 is 347124181.

181421743 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181421743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181421143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90710871 + 90710872.

It is an arithmetic number, because the mean of its divisors is an integer number (90710872).

Almost surely, 2^181421743 is an apocalyptic number.

181421743 is a deficient number, since it is larger than the sum of its proper divisors (1).

181421743 is an equidigital number, since it uses as much as digits as its factorization.

181421743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 31.

The square root of 181421743 is about 13469.2888824912. The cubic root of 181421743 is about 566.1042886988.

The spelling of 181421743 in words is "one hundred eighty-one million, four hundred twenty-one thousand, seven hundred forty-three".