42219913 has 2 divisors, whose sum is σ = 42219914. Its totient is φ = 42219912.

The previous prime is 42219907. The next prime is 42219917. The reversal of 42219913 is 31991224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36324729 + 5895184 = 6027^2 + 2428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42219913 is a prime.

It is not a weakly prime, because it can be changed into another prime (42219917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21109956 + 21109957.

It is an arithmetic number, because the mean of its divisors is an integer number (21109957).

Almost surely, 2^42219913 is an apocalyptic number.

It is an amenable number.

42219913 is a deficient number, since it is larger than the sum of its proper divisors (1).

42219913 is an equidigital number, since it uses as much as digits as its factorization.

42219913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 31.

The square root of 42219913 is about 6497.6852032089. The cubic root of 42219913 is about 348.2082939611.

The spelling of 42219913 in words is "forty-two million, two hundred nineteen thousand, nine hundred thirteen".