5091521 has 2 divisors, whose sum is σ = 5091522. Its totient is φ = 5091520.

The previous prime is 5091509. The next prime is 5091529. The reversal of 5091521 is 1251905.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5013121 + 78400 = 2239^2 + 280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5091521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (5091529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2545760 + 2545761.

It is an arithmetic number, because the mean of its divisors is an integer number (2545761).

Almost surely, 2^5091521 is an apocalyptic number.

It is an amenable number.

5091521 is a deficient number, since it is larger than the sum of its proper divisors (1).

5091521 is an equidigital number, since it uses as much as digits as its factorization.

5091521 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 23.

The square root of 5091521 is about 2256.4398950559. The cubic root of 5091521 is about 172.0346176041.

The spelling of 5091521 in words is "five million, ninety-one thousand, five hundred twenty-one".