99999457 has 4 divisors (see below), whose sum is σ = 105881796. Its totient is φ = 94117120.

The previous prime is 99999439. The next prime is 99999481. The reversal of 99999457 is 75499999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75499999 = 59 ⋅1279661.

It can be written as a sum of positive squares in 2 ways, for example, as 90611361 + 9388096 = 9519^2 + 3064^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999457 - 2⁷ = 99999329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99999395 and 99999404.

It is not an unprimeable number, because it can be changed into a prime (99999437) 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, 2941144 + ... + 2941177.

It is an arithmetic number, because the mean of its divisors is an integer number (26470449).

Almost surely, 2^99999457 is an apocalyptic number.

It is an amenable number.

99999457 is a deficient number, since it is larger than the sum of its proper divisors (5882339).

99999457 is a wasteful number, since it uses less digits than its factorization.

99999457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5882338.

The product of its digits is 8266860, while the sum is 61.

The square root of 99999457 is about 9999.9728499631. The cubic root of 99999457 is about 464.1580432322.

The spelling of 99999457 in words is "ninety-nine million, nine hundred ninety-nine thousand, four hundred fifty-seven".