31442133 has 4 divisors (see below), whose sum is σ = 41922848. Its totient is φ = 20961420.

The previous prime is 31442113. The next prime is 31442141. The reversal of 31442133 is 33124413.

31442133 is nontrivially palindromic in base 5.

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 not a de Polignac number, because 31442133 - 2⁵ = 31442101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442113) 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, 5240353 + ... + 5240358.

It is an arithmetic number, because the mean of its divisors is an integer number (10480712).

Almost surely, 2^31442133 is an apocalyptic number.

It is an amenable number.

31442133 is a deficient number, since it is larger than the sum of its proper divisors (10480715).

31442133 is a wasteful number, since it uses less digits than its factorization.

31442133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10480714.

The product of its digits is 864, while the sum is 21.

The square root of 31442133 is about 5607.3285083005. The cubic root of 31442133 is about 315.6244704497.

Adding to 31442133 its reverse (33124413), we get a palindrome (64566546).

The spelling of 31442133 in words is "thirty-one million, four hundred forty-two thousand, one hundred thirty-three".