998457001 has 4 divisors (see below), whose sum is σ = 999016900. Its totient is φ = 997897104.

The previous prime is 998456993. The next prime is 998457023. The reversal of 998457001 is 100754899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100754899 = 7 ⋅14393557.

It can be written as a sum of positive squares in 2 ways, for example, as 981192976 + 17264025 = 31324^2 + 4155^2 .

It is a cyclic number.

It is not a de Polignac number, because 998457001 - 2³ = 998456993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998457401) 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 3 ways as a sum of consecutive naturals, for example, 277266 + ... + 280843.

It is an arithmetic number, because the mean of its divisors is an integer number (249754225).

Almost surely, 2^998457001 is an apocalyptic number.

It is an amenable number.

998457001 is a deficient number, since it is larger than the sum of its proper divisors (559899).

998457001 is a wasteful number, since it uses less digits than its factorization.

998457001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559898.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 998457001 is about 31598.3702269595. The cubic root of 998457001 is about 999.4854022346.

The spelling of 998457001 in words is "nine hundred ninety-eight million, four hundred fifty-seven thousand, one".