31411221 has 4 divisors (see below), whose sum is σ = 41881632. Its totient is φ = 20940812.

The previous prime is 31411201. The next prime is 31411229. The reversal of 31411221 is 12211413.

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 31411221 - 2¹⁵ = 31378453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31411221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31411229) 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, 5235201 + ... + 5235206.

It is an arithmetic number, because the mean of its divisors is an integer number (10470408).

Almost surely, 2^31411221 is an apocalyptic number.

It is an amenable number.

31411221 is a deficient number, since it is larger than the sum of its proper divisors (10470411).

31411221 is a wasteful number, since it uses less digits than its factorization.

31411221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10470410.

The product of its digits is 48, while the sum is 15.

The square root of 31411221 is about 5604.5714376748. The cubic root of 31411221 is about 315.5210022495.

Adding to 31411221 its reverse (12211413), we get a palindrome (43622634).

The spelling of 31411221 in words is "thirty-one million, four hundred eleven thousand, two hundred twenty-one".