906537521 has 2 divisors, whose sum is σ = 906537522. Its totient is φ = 906537520.

The previous prime is 906537509. The next prime is 906537523. The reversal of 906537521 is 125735609.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 896703025 + 9834496 = 29945^2 + 3136^2 .

It is an emirp because it is prime and its reverse (125735609) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-906537521 is a prime.

Together with 906537523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (906537523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453268760 + 453268761.

It is an arithmetic number, because the mean of its divisors is an integer number (453268761).

Almost surely, 2^906537521 is an apocalyptic number.

It is an amenable number.

906537521 is a deficient number, since it is larger than the sum of its proper divisors (1).

906537521 is an equidigital number, since it uses as much as digits as its factorization.

906537521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 38.

The square root of 906537521 is about 30108.7615321521. The cubic root of 906537521 is about 967.8214903310.

The spelling of 906537521 in words is "nine hundred six million, five hundred thirty-seven thousand, five hundred twenty-one".