31444421 has 4 divisors (see below), whose sum is σ = 31496832. Its totient is φ = 31392012.

The previous prime is 31444403. The next prime is 31444453. The reversal of 31444421 is 12444413.

It is a happy number.

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 31444421 - 2¹⁰ = 31443397 is a prime.

It is a super-2 number, since 2×31444421² = 1977503224050482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31444471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25295 + ... + 26508.

It is an arithmetic number, because the mean of its divisors is an integer number (7874208).

Almost surely, 2^31444421 is an apocalyptic number.

It is an amenable number.

31444421 is a deficient number, since it is larger than the sum of its proper divisors (52411).

31444421 is an equidigital number, since it uses as much as digits as its factorization.

31444421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52410.

The product of its digits is 1536, while the sum is 23.

The square root of 31444421 is about 5607.5325233118. The cubic root of 31444421 is about 315.6321261143.

Adding to 31444421 its reverse (12444413), we get a palindrome (43888834).

The spelling of 31444421 in words is "thirty-one million, four hundred forty-four thousand, four hundred twenty-one".