42001331 has 4 divisors (see below), whose sum is σ = 42022464. Its totient is φ = 41980200.

The previous prime is 42001319. The next prime is 42001357. The reversal of 42001331 is 13310024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42001331 is a prime.

It is a super-2 number, since 2×42001331² = 3528223611543122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42001301) 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, 7235 + ... + 11676.

It is an arithmetic number, because the mean of its divisors is an integer number (10505616).

Almost surely, 2^42001331 is an apocalyptic number.

42001331 is a deficient number, since it is larger than the sum of its proper divisors (21133).

42001331 is a wasteful number, since it uses less digits than its factorization.

42001331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21132.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 42001331 is about 6480.8433864737. The cubic root of 42001331 is about 347.6063363478.

Adding to 42001331 its reverse (13310024), we get a palindrome (55311355).

The spelling of 42001331 in words is "forty-two million, one thousand, three hundred thirty-one".