445681319 has 2 divisors, whose sum is σ = 445681320. Its totient is φ = 445681318.

The previous prime is 445681303. The next prime is 445681321. The reversal of 445681319 is 913186544.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 445681319 - 2⁴ = 445681303 is a prime.

It is a super-2 number, since 2×445681319² = 397263676211159522, which contains 22 as substring.

Together with 445681321, 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 (445684319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222840659 + 222840660.

It is an arithmetic number, because the mean of its divisors is an integer number (222840660).

Almost surely, 2^445681319 is an apocalyptic number.

445681319 is a deficient number, since it is larger than the sum of its proper divisors (1).

445681319 is an equidigital number, since it uses as much as digits as its factorization.

445681319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 445681319 is about 21111.1657423270. The cubic root of 445681319 is about 763.8501066232.

The spelling of 445681319 in words is "four hundred forty-five million, six hundred eighty-one thousand, three hundred nineteen".