442681913 has 2 divisors, whose sum is σ = 442681914. Its totient is φ = 442681912.

The previous prime is 442681903. The next prime is 442681933. The reversal of 442681913 is 319186244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 369869824 + 72812089 = 19232^2 + 8533^2 .

It is a cyclic number.

It is not a de Polignac number, because 442681913 - 2¹² = 442677817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (442681903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221340956 + 221340957.

It is an arithmetic number, because the mean of its divisors is an integer number (221340957).

Almost surely, 2^442681913 is an apocalyptic number.

It is an amenable number.

442681913 is a deficient number, since it is larger than the sum of its proper divisors (1).

442681913 is an equidigital number, since it uses as much as digits as its factorization.

442681913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 442681913 is about 21040.0074382116. The cubic root of 442681913 is about 762.1326944715.

The spelling of 442681913 in words is "four hundred forty-two million, six hundred eighty-one thousand, nine hundred thirteen".