981224851 has 4 divisors (see below), whose sum is σ = 982925992. Its totient is φ = 979523712.

The previous prime is 981224843. The next prime is 981224857. The reversal of 981224851 is 158422189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158422189 = 461 ⋅343649.

It is a cyclic number.

It is not a de Polignac number, because 981224851 - 2³ = 981224843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981224857) 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, 849705 + ... + 850858.

It is an arithmetic number, because the mean of its divisors is an integer number (245731498).

Almost surely, 2^981224851 is an apocalyptic number.

981224851 is a deficient number, since it is larger than the sum of its proper divisors (1701141).

981224851 is a wasteful number, since it uses less digits than its factorization.

981224851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701140.

The product of its digits is 46080, while the sum is 40.

The square root of 981224851 is about 31324.5087910409. The cubic root of 981224851 is about 993.7020359166.

The spelling of 981224851 in words is "nine hundred eighty-one million, two hundred twenty-four thousand, eight hundred fifty-one".