31052221 has 2 divisors, whose sum is σ = 31052222. Its totient is φ = 31052220.

The previous prime is 31052201. The next prime is 31052227. The reversal of 31052221 is 12225013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30404196 + 648025 = 5514^2 + 805^2 .

It is a cyclic number.

It is not a de Polignac number, because 31052221 - 2¹³ = 31044029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31052195 and 31052204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31052227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15526110 + 15526111.

It is an arithmetic number, because the mean of its divisors is an integer number (15526111).

Almost surely, 2^31052221 is an apocalyptic number.

It is an amenable number.

31052221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31052221 is an equidigital number, since it uses as much as digits as its factorization.

31052221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 31052221 is about 5572.4519737724. The cubic root of 31052221 is about 314.3143598743.

Adding to 31052221 its reverse (12225013), we get a palindrome (43277234).

The spelling of 31052221 in words is "thirty-one million, fifty-two thousand, two hundred twenty-one".