9997551 has 6 divisors (see below), whose sum is σ = 14440920. Its totient is φ = 6665028.

The previous prime is 9997523. The next prime is 9997573. The reversal of 9997551 is 1557999.

9997551 is a `hidden beast` number, since 9 + 9 + 97 + 551 = 666.

It is not a de Polignac number, because 9997551 - 2²² = 5803247 is a prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9997497 and 9997506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 555411 + ... + 555428.

It is an arithmetic number, because the mean of its divisors is an integer number (2406820).

Almost surely, 2^9997551 is an apocalyptic number.

9997551 is a deficient number, since it is larger than the sum of its proper divisors (4443369).

9997551 is a wasteful number, since it uses less digits than its factorization.

9997551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110845 (or 1110842 counting only the distinct ones).

The product of its digits is 127575, while the sum is 45.

The square root of 9997551 is about 3161.8904155584. The cubic root of 9997551 is about 215.4258801988.

The spelling of 9997551 in words is "nine million, nine hundred ninety-seven thousand, five hundred fifty-one".