42084661 has 2 divisors, whose sum is σ = 42084662. Its totient is φ = 42084660.

The previous prime is 42084631. The next prime is 42084671. The reversal of 42084661 is 16648024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37271025 + 4813636 = 6105^2 + 2194^2 .

It is a cyclic number.

It is not a de Polignac number, because 42084661 - 2⁷ = 42084533 is a prime.

It is a super-2 number, since 2×42084661² = 3542237382969842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42084631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21042330 + 21042331.

It is an arithmetic number, because the mean of its divisors is an integer number (21042331).

Almost surely, 2^42084661 is an apocalyptic number.

It is an amenable number.

42084661 is a deficient number, since it is larger than the sum of its proper divisors (1).

42084661 is an equidigital number, since it uses as much as digits as its factorization.

42084661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 42084661 is about 6487.2691481085. The cubic root of 42084661 is about 347.8360663774.

The spelling of 42084661 in words is "forty-two million, eighty-four thousand, six hundred sixty-one".