42601681 has 4 divisors (see below), whose sum is σ = 44453952. Its totient is φ = 40749412.

The previous prime is 42601679. The next prime is 42601703. The reversal of 42601681 is 18610624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42601681 - 2¹ = 42601679 is a prime.

It is a super-2 number, since 2×42601681² = 3629806448051522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42601621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 926101 + ... + 926146.

It is an arithmetic number, because the mean of its divisors is an integer number (11113488).

Almost surely, 2^42601681 is an apocalyptic number.

It is an amenable number.

42601681 is a deficient number, since it is larger than the sum of its proper divisors (1852271).

42601681 is a wasteful number, since it uses less digits than its factorization.

42601681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852270.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 42601681 is about 6526.9963229651. The cubic root of 42601681 is about 349.2546888459.

The spelling of 42601681 in words is "forty-two million, six hundred one thousand, six hundred eighty-one".