999425197 has 4 divisors (see below), whose sum is σ = 1001810880. Its totient is φ = 997039516.

The previous prime is 999425191. The next prime is 999425239. The reversal of 999425197 is 791524999.

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 an emirpimes, since its reverse is a distinct semiprime: 791524999 = 233 ⋅3397103.

It is a cyclic number.

It is not a de Polignac number, because 999425197 - 2²³ = 991036589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999425191) 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, 1192213 + ... + 1193050.

It is an arithmetic number, because the mean of its divisors is an integer number (250452720).

Almost surely, 2^999425197 is an apocalyptic number.

It is an amenable number.

999425197 is a deficient number, since it is larger than the sum of its proper divisors (2385683).

999425197 is a wasteful number, since it uses less digits than its factorization.

999425197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385682.

The product of its digits is 1837080, while the sum is 55.

The square root of 999425197 is about 31613.6868618641. The cubic root of 999425197 is about 999.8083622773.

The spelling of 999425197 in words is "nine hundred ninety-nine million, four hundred twenty-five thousand, one hundred ninety-seven".