450186421 has 2 divisors, whose sum is σ = 450186422. Its totient is φ = 450186420.

The previous prime is 450186419. The next prime is 450186449. The reversal of 450186421 is 124681054.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 328878225 + 121308196 = 18135^2 + 11014^2 .

It is a cyclic number.

It is not a de Polignac number, because 450186421 - 2¹ = 450186419 is a prime.

Together with 450186419, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (450186481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225093210 + 225093211.

It is an arithmetic number, because the mean of its divisors is an integer number (225093211).

Almost surely, 2^450186421 is an apocalyptic number.

It is an amenable number.

450186421 is a deficient number, since it is larger than the sum of its proper divisors (1).

450186421 is an equidigital number, since it uses as much as digits as its factorization.

450186421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 450186421 is about 21217.5969657263. The cubic root of 450186421 is about 766.4152371701.

The spelling of 450186421 in words is "four hundred fifty million, one hundred eighty-six thousand, four hundred twenty-one".