31521053 has 2 divisors, whose sum is σ = 31521054. Its totient is φ = 31521052.

The previous prime is 31521037. The next prime is 31521131. The reversal of 31521053 is 35012513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26759929 + 4761124 = 5173^2 + 2182^2 .

It is a cyclic number.

It is not a de Polignac number, because 31521053 - 2⁴ = 31521037 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31521353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15760526 + 15760527.

It is an arithmetic number, because the mean of its divisors is an integer number (15760527).

Almost surely, 2^31521053 is an apocalyptic number.

It is an amenable number.

31521053 is a deficient number, since it is larger than the sum of its proper divisors (1).

31521053 is an equidigital number, since it uses as much as digits as its factorization.

31521053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 31521053 is about 5614.3613171936. The cubic root of 31521053 is about 315.8883231126. Note that the first 3 decimals are identical.

Adding to 31521053 its reverse (35012513), we get a palindrome (66533566).

The spelling of 31521053 in words is "thirty-one million, five hundred twenty-one thousand, fifty-three".