42211409 has 2 divisors, whose sum is σ = 42211410. Its totient is φ = 42211408.

The previous prime is 42211363. The next prime is 42211439. The reversal of 42211409 is 90411224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42211009 + 400 = 6497^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 42211409 - 2¹² = 42207313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42211439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21105704 + 21105705.

It is an arithmetic number, because the mean of its divisors is an integer number (21105705).

Almost surely, 2^42211409 is an apocalyptic number.

It is an amenable number.

42211409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42211409 is an equidigital number, since it uses as much as digits as its factorization.

42211409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 42211409 is about 6497.0307833656. The cubic root of 42211409 is about 348.1849135073.

The spelling of 42211409 in words is "forty-two million, two hundred eleven thousand, four hundred nine".