42757081 has 2 divisors, whose sum is σ = 42757082. Its totient is φ = 42757080.

The previous prime is 42757073. The next prime is 42757111. The reversal of 42757081 is 18075724.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37393225 + 5363856 = 6115^2 + 2316^2 .

It is a cyclic number.

It is not a de Polignac number, because 42757081 - 2³ = 42757073 is a prime.

It is a super-2 number, since 2×42757081² = 3656335951281122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42757021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21378540 + 21378541.

It is an arithmetic number, because the mean of its divisors is an integer number (21378541).

Almost surely, 2^42757081 is an apocalyptic number.

It is an amenable number.

42757081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42757081 is an equidigital number, since it uses as much as digits as its factorization.

42757081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 42757081 is about 6538.8898904936. The cubic root of 42757081 is about 349.6788373617.

The spelling of 42757081 in words is "forty-two million, seven hundred fifty-seven thousand, eighty-one".