446621381 has 2 divisors, whose sum is σ = 446621382. Its totient is φ = 446621380.

The previous prime is 446621377. The next prime is 446621387. The reversal of 446621381 is 183126644.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 381577156 + 65044225 = 19534^2 + 8065^2 .

It is a cyclic number.

It is not a de Polignac number, because 446621381 - 2² = 446621377 is a prime.

It is a super-2 number, since 2×446621381² = 398941315932694322, which contains 22 as substring.

It is equal to p_23683427 and since 446621381 and 23683427 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (446621387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223310690 + 223310691.

It is an arithmetic number, because the mean of its divisors is an integer number (223310691).

Almost surely, 2^446621381 is an apocalyptic number.

It is an amenable number.

446621381 is a deficient number, since it is larger than the sum of its proper divisors (1).

446621381 is an equidigital number, since it uses as much as digits as its factorization.

446621381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 35.

The square root of 446621381 is about 21133.4185828985. The cubic root of 446621381 is about 764.3867847038.

The spelling of 446621381 in words is "four hundred forty-six million, six hundred twenty-one thousand, three hundred eighty-one".