9970521 has 20 divisors (see below), whose sum is σ = 14687760. Its totient is φ = 6016120.

The previous prime is 9970489. The next prime is 9970529. The reversal of 9970521 is 1250799.

It is not a de Polignac number, because 9970521 - 2⁵ = 9970489 is a prime.

It is a super-2 number, since 2×9970521² = 198822578022882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9970529) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 43810 + ... + 44036.

It is an arithmetic number, because the mean of its divisors is an integer number (734388).

Almost surely, 2^9970521 is an apocalyptic number.

It is an amenable number.

9970521 is a deficient number, since it is larger than the sum of its proper divisors (4717239).

9970521 is an equidigital number, since it uses as much as digits as its factorization.

9970521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 9970521 is about 3157.6131808694. The cubic root of 9970521 is about 215.2315587024.

The spelling of 9970521 in words is "nine million, nine hundred seventy thousand, five hundred twenty-one".