181452421 has 2 divisors, whose sum is σ = 181452422. Its totient is φ = 181452420.

The previous prime is 181452367. The next prime is 181452433. The reversal of 181452421 is 124254181.

181452421 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 can be written as a sum of positive squares in only one way, i.e., 120143521 + 61308900 = 10961^2 + 7830^2 .

It is an emirp because it is prime and its reverse (124254181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181452421 - 2²⁵ = 147897989 is a prime.

It is a super-2 number, since 2×181452421² = 65849962173522482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 181452421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181452461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90726210 + 90726211.

It is an arithmetic number, because the mean of its divisors is an integer number (90726211).

Almost surely, 2^181452421 is an apocalyptic number.

It is an amenable number.

181452421 is a deficient number, since it is larger than the sum of its proper divisors (1).

181452421 is an equidigital number, since it uses as much as digits as its factorization.

181452421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2560, while the sum is 28.

The square root of 181452421 is about 13470.4276472575. The cubic root of 181452421 is about 566.1361958787.

The spelling of 181452421 in words is "one hundred eighty-one million, four hundred fifty-two thousand, four hundred twenty-one".