31418221 has 8 divisors (see below), whose sum is σ = 32844800. Its totient is φ = 30017520.

The previous prime is 31418213. The next prime is 31418237. The reversal of 31418221 is 12281413.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31418221 - 2³ = 31418213 is a prime.

It is a super-2 number, since 2×31418221² = 1974209221609682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31418192 and 31418201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31418201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3966 + ... + 8863.

It is an arithmetic number, because the mean of its divisors is an integer number (4105600).

Almost surely, 2^31418221 is an apocalyptic number.

31418221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31418221 is a deficient number, since it is larger than the sum of its proper divisors (1426579).

31418221 is a wasteful number, since it uses less digits than its factorization.

31418221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12939.

The product of its digits is 384, while the sum is 22.

The square root of 31418221 is about 5605.1958930978. The cubic root of 31418221 is about 315.5444384919.

Adding to 31418221 its reverse (12281413), we get a palindrome (43699634).

The spelling of 31418221 in words is "thirty-one million, four hundred eighteen thousand, two hundred twenty-one".