42581137 has 4 divisors (see below), whose sum is σ = 43571440. Its totient is φ = 41590836.

The previous prime is 42581129. The next prime is 42581153. The reversal of 42581137 is 73118524.

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 42581137 - 2³ = 42581129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42581099 and 42581108.

It is not an unprimeable number, because it can be changed into a prime (42581437) 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, 495087 + ... + 495172.

It is an arithmetic number, because the mean of its divisors is an integer number (10892860).

Almost surely, 2^42581137 is an apocalyptic number.

It is an amenable number.

42581137 is a deficient number, since it is larger than the sum of its proper divisors (990303).

42581137 is an equidigital number, since it uses as much as digits as its factorization.

42581137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990302.

The product of its digits is 6720, while the sum is 31.

The square root of 42581137 is about 6525.4223618092. The cubic root of 42581137 is about 349.1985389333.

The spelling of 42581137 in words is "forty-two million, five hundred eighty-one thousand, one hundred thirty-seven".