442001381 has 2 divisors, whose sum is σ = 442001382. Its totient is φ = 442001380.

The previous prime is 442001369. The next prime is 442001407. The reversal of 442001381 is 183100244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 417548356 + 24453025 = 20434^2 + 4945^2 .

It is a cyclic number.

It is not a de Polignac number, because 442001381 - 2²² = 437807077 is a prime.

It is a super-2 number, since 2×442001381² = 390730441611814322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442003381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221000690 + 221000691.

It is an arithmetic number, because the mean of its divisors is an integer number (221000691).

Almost surely, 2^442001381 is an apocalyptic number.

It is an amenable number.

442001381 is a deficient number, since it is larger than the sum of its proper divisors (1).

442001381 is an equidigital number, since it uses as much as digits as its factorization.

442001381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 442001381 is about 21023.8288853387. The cubic root of 442001381 is about 761.7419536453.

The spelling of 442001381 in words is "four hundred forty-two million, one thousand, three hundred eighty-one".