42637081 has 4 divisors (see below), whose sum is σ = 42776272. Its totient is φ = 42497892.

The previous prime is 42637079. The next prime is 42637087. The reversal of 42637081 is 18073624.

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 42637081 - 2¹ = 42637079 is a prime.

It is a super-2 number, since 2×42637081² = 3635841352401122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42637087) 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, 69135 + ... + 69748.

It is an arithmetic number, because the mean of its divisors is an integer number (10694068).

Almost surely, 2^42637081 is an apocalyptic number.

It is an amenable number.

42637081 is a deficient number, since it is larger than the sum of its proper divisors (139191).

42637081 is a wasteful number, since it uses less digits than its factorization.

42637081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139190.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 42637081 is about 6529.7075738505. The cubic root of 42637081 is about 349.3514001551.

The spelling of 42637081 in words is "forty-two million, six hundred thirty-seven thousand, eighty-one".