42605081 has 2 divisors, whose sum is σ = 42605082. Its totient is φ = 42605080.

The previous prime is 42605051. The next prime is 42605137. The reversal of 42605081 is 18050624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22174681 + 20430400 = 4709^2 + 4520^2 .

It is a cyclic number.

It is not a de Polignac number, because 42605081 - 2¹⁴ = 42588697 is a prime.

It is a super-2 number, since 2×42605081² = 3630385854033122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42605081.

It is not a weakly prime, because it can be changed into another prime (42605051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21302540 + 21302541.

It is an arithmetic number, because the mean of its divisors is an integer number (21302541).

Almost surely, 2^42605081 is an apocalyptic number.

It is an amenable number.

42605081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42605081 is an equidigital number, since it uses as much as digits as its factorization.

42605081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 42605081 is about 6527.2567744804. The cubic root of 42605081 is about 349.2639798279.

The spelling of 42605081 in words is "forty-two million, six hundred five thousand, eighty-one".