42420061 has 4 divisors (see below), whose sum is σ = 42529500. Its totient is φ = 42310624.

The previous prime is 42420031. The next prime is 42420067. The reversal of 42420061 is 16002424.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2805625 + 39614436 = 1675^2 + 6294^2 .

It is a cyclic number.

It is not a de Polignac number, because 42420061 - 2⁹ = 42419549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42420067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54136 + ... + 54913.

It is an arithmetic number, because the mean of its divisors is an integer number (10632375).

Almost surely, 2^42420061 is an apocalyptic number.

It is an amenable number.

42420061 is a deficient number, since it is larger than the sum of its proper divisors (109439).

42420061 is a wasteful number, since it uses less digits than its factorization.

42420061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109438.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 42420061 is about 6513.0684780678. The cubic root of 42420061 is about 348.7576662712.

Adding to 42420061 its reverse (16002424), we get a palindrome (58422485).

The spelling of 42420061 in words is "forty-two million, four hundred twenty thousand, sixty-one".