42745081 has 2 divisors, whose sum is σ = 42745082. Its totient is φ = 42745080.

The previous prime is 42745067. The next prime is 42745091. The reversal of 42745081 is 18054724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39576681 + 3168400 = 6291^2 + 1780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42745081 is a prime.

It is a super-2 number, since 2×42745081² = 3654283899393122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42745051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21372540 + 21372541.

It is an arithmetic number, because the mean of its divisors is an integer number (21372541).

Almost surely, 2^42745081 is an apocalyptic number.

It is an amenable number.

42745081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42745081 is an equidigital number, since it uses as much as digits as its factorization.

42745081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 42745081 is about 6537.9722391579. The cubic root of 42745081 is about 349.6461212316.

The spelling of 42745081 in words is "forty-two million, seven hundred forty-five thousand, eighty-one".