4997521 has 2 divisors, whose sum is σ = 4997522. Its totient is φ = 4997520.

The previous prime is 4997491. The next prime is 4997533. The reversal of 4997521 is 1257994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3651921 + 1345600 = 1911^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 4997521 - 2⁷ = 4997393 is a prime.

It is a super-2 number, since 2×4997521² = 49950432290882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4997621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2498760 + 2498761.

It is an arithmetic number, because the mean of its divisors is an integer number (2498761).

Almost surely, 2^4997521 is an apocalyptic number.

It is an amenable number.

4997521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4997521 is an equidigital number, since it uses as much as digits as its factorization.

4997521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 4997521 is about 2235.5135875230. The cubic root of 4997521 is about 170.9693297934.

The spelling of 4997521 in words is "four million, nine hundred ninety-seven thousand, five hundred twenty-one".