9975557 has 4 divisors (see below), whose sum is σ = 9984576. Its totient is φ = 9966540.

The previous prime is 9975547. The next prime is 9975569. The reversal of 9975557 is 7555799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7555799 = 23 ⋅328513.

It is a cyclic number.

It is not a de Polignac number, because 9975557 - 2¹² = 9971461 is a prime.

It is a d-powerful number, because it can be written as 9⁷ + 9⁷ + 7³ + 5⁴ + 5⁶ + 5⁸ + 7⁴ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9975547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2573 + ... + 5154.

It is an arithmetic number, because the mean of its divisors is an integer number (2496144).

Almost surely, 2^9975557 is an apocalyptic number.

It is an amenable number.

9975557 is a deficient number, since it is larger than the sum of its proper divisors (9019).

9975557 is a wasteful number, since it uses less digits than its factorization.

9975557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9018.

The product of its digits is 496125, while the sum is 47.

The square root of 9975557 is about 3158.4105179663. The cubic root of 9975557 is about 215.2677896306.

The spelling of 9975557 in words is "nine million, nine hundred seventy-five thousand, five hundred fifty-seven".