42560981 has 8 divisors (see below), whose sum is σ = 43710744. Its totient is φ = 41425920.

The previous prime is 42560977. The next prime is 42561031. The reversal of 42560981 is 18906524.

It can be written as a sum of positive squares in 4 ways, for example, as 1716100 + 40844881 = 1310^2 + 6391^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42560981 - 2² = 42560977 is a prime.

It is a super-2 number, since 2×42560981² = 3622874207364722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42563981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2321 + ... + 9513.

It is an arithmetic number, because the mean of its divisors is an integer number (5463843).

Almost surely, 2^42560981 is an apocalyptic number.

It is an amenable number.

42560981 is a deficient number, since it is larger than the sum of its proper divisors (1149763).

42560981 is an equidigital number, since it uses as much as digits as its factorization.

42560981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7351.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 42560981 is about 6523.8777578983. The cubic root of 42560981 is about 349.1434319297.

The spelling of 42560981 in words is "forty-two million, five hundred sixty thousand, nine hundred eighty-one".