454021639 has 2 divisors, whose sum is σ = 454021640. Its totient is φ = 454021638.

The previous prime is 454021627. The next prime is 454021661. The reversal of 454021639 is 936120454.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-454021639 is a prime.

It is a super-2 number, since 2×454021639² = 412271297360492642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (454024639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 227010819 + 227010820.

It is an arithmetic number, because the mean of its divisors is an integer number (227010820).

Almost surely, 2^454021639 is an apocalyptic number.

454021639 is a deficient number, since it is larger than the sum of its proper divisors (1).

454021639 is an equidigital number, since it uses as much as digits as its factorization.

454021639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 454021639 is about 21307.7835309072. The cubic root of 454021639 is about 768.5854949827.

The spelling of 454021639 in words is "four hundred fifty-four million, twenty-one thousand, six hundred thirty-nine".