42427081 has 2 divisors, whose sum is σ = 42427082. Its totient is φ = 42427080.

The previous prime is 42427067. The next prime is 42427097. The reversal of 42427081 is 18072424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27092025 + 15335056 = 5205^2 + 3916^2 .

It is a cyclic number.

It is not a de Polignac number, because 42427081 - 2²¹ = 40329929 is a prime.

It is a super-2 number, since 2×42427081² = 3600114404361122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42427061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21213540 + 21213541.

It is an arithmetic number, because the mean of its divisors is an integer number (21213541).

Almost surely, 2^42427081 is an apocalyptic number.

It is an amenable number.

42427081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42427081 is an equidigital number, since it uses as much as digits as its factorization.

42427081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 42427081 is about 6513.6073722631. The cubic root of 42427081 is about 348.7769035826.

The spelling of 42427081 in words is "forty-two million, four hundred twenty-seven thousand, eighty-one".