99975551 has 8 divisors (see below), whose sum is σ = 107934960. Its totient is φ = 92054592.

The previous prime is 99975541. The next prime is 99975553. The reversal of 99975551 is 15557999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99975551 is a prime.

It is a super-2 number, since 2×99975551² = 19990221595507202, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99975551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99975553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4085 + ... + 14718.

It is an arithmetic number, because the mean of its divisors is an integer number (13491870).

Almost surely, 2^99975551 is an apocalyptic number.

99975551 is a deficient number, since it is larger than the sum of its proper divisors (7959409).

99975551 is a wasteful number, since it uses less digits than its factorization.

99975551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19225.

The product of its digits is 637875, while the sum is 50.

The square root of 99975551 is about 9998.7774752717. Note that the first 3 decimals coincide. The cubic root of 99975551 is about 464.1210528763.

The spelling of 99975551 in words is "ninety-nine million, nine hundred seventy-five thousand, five hundred fifty-one".