31274521 has 2 divisors, whose sum is σ = 31274522. Its totient is φ = 31274520.

The previous prime is 31274519. The next prime is 31274533. The reversal of 31274521 is 12547213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28515600 + 2758921 = 5340^2 + 1661^2 .

It is a cyclic number.

It is not a de Polignac number, because 31274521 - 2¹ = 31274519 is a prime.

Together with 31274519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31274821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15637260 + 15637261.

It is an arithmetic number, because the mean of its divisors is an integer number (15637261).

Almost surely, 2^31274521 is an apocalyptic number.

It is an amenable number.

31274521 is a deficient number, since it is larger than the sum of its proper divisors (1).

31274521 is an equidigital number, since it uses as much as digits as its factorization.

31274521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 25.

The square root of 31274521 is about 5592.3627385927. The cubic root of 31274521 is about 315.0626263321.

The spelling of 31274521 in words is "thirty-one million, two hundred seventy-four thousand, five hundred twenty-one".