445597381 has 2 divisors, whose sum is σ = 445597382. Its totient is φ = 445597380.

The previous prime is 445597357. The next prime is 445597391. The reversal of 445597381 is 183795544.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397364356 + 48233025 = 19934^2 + 6945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445597381 is a prime.

It is a super-3 number, since 3×445597381³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (445597351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222798690 + 222798691.

It is an arithmetic number, because the mean of its divisors is an integer number (222798691).

Almost surely, 2^445597381 is an apocalyptic number.

It is an amenable number.

445597381 is a deficient number, since it is larger than the sum of its proper divisors (1).

445597381 is an equidigital number, since it uses as much as digits as its factorization.

445597381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 46.

The square root of 445597381 is about 21109.1776485964. The cubic root of 445597381 is about 763.8021500280.

The spelling of 445597381 in words is "four hundred forty-five million, five hundred ninety-seven thousand, three hundred eighty-one".