31224001 has 4 divisors (see below), whose sum is σ = 31985604. Its totient is φ = 30462400.

The previous prime is 31223989. The next prime is 31224007. The reversal of 31224001 is 10042213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10042213 = 59 ⋅170207.

It can be written as a sum of positive squares in 2 ways, for example, as 16200625 + 15023376 = 4025^2 + 3876^2 .

It is a cyclic number.

It is not a de Polignac number, because 31224001 - 2⁷ = 31223873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31224007) 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, 380740 + ... + 380821.

It is an arithmetic number, because the mean of its divisors is an integer number (7996401).

Almost surely, 2^31224001 is an apocalyptic number.

It is an amenable number.

31224001 is a deficient number, since it is larger than the sum of its proper divisors (761603).

31224001 is an equidigital number, since it uses as much as digits as its factorization.

31224001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761602.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 31224001 is about 5587.8440386253. The cubic root of 31224001 is about 314.8928870717.

Adding to 31224001 its reverse (10042213), we get a palindrome (41266214).

The spelling of 31224001 in words is "thirty-one million, two hundred twenty-four thousand, one".