851198417 has 4 divisors (see below), whose sum is σ = 871959396. Its totient is φ = 830437440.

The previous prime is 851198393. The next prime is 851198473. The reversal of 851198417 is 714891158.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68541841 + 782656576 = 8279^2 + 27976^2 .

It is a cyclic number.

It is not a de Polignac number, because 851198417 - 2¹⁶ = 851132881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851198617) 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, 10380428 + ... + 10380509.

It is an arithmetic number, because the mean of its divisors is an integer number (217989849).

Almost surely, 2^851198417 is an apocalyptic number.

It is an amenable number.

851198417 is a deficient number, since it is larger than the sum of its proper divisors (20760979).

851198417 is a wasteful number, since it uses less digits than its factorization.

851198417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20760978.

The product of its digits is 80640, while the sum is 44.

The square root of 851198417 is about 29175.3049170013. The cubic root of 851198417 is about 947.7132133659.

The spelling of 851198417 in words is "eight hundred fifty-one million, one hundred ninety-eight thousand, four hundred seventeen".