981852921 has 28 divisors (see below), whose sum is σ = 1682415552. Its totient is φ = 561055896.

The previous prime is 981852919. The next prime is 981852923. The reversal of 981852921 is 129258189.

981852921 is a `hidden beast` number, since 98 + 18 + 529 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (981852919) and next prime (981852923).

It is not a de Polignac number, because 981852921 - 2¹ = 981852919 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981852923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 91101 + ... + 101306.

Almost surely, 2^981852921 is an apocalyptic number.

It is an amenable number.

981852921 is a deficient number, since it is larger than the sum of its proper divisors (700562631).

981852921 is an equidigital number, since it uses as much as digits as its factorization.

981852921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192432 (or 192417 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 981852921 is about 31334.5324043618. The cubic root of 981852921 is about 993.9140095269.

The spelling of 981852921 in words is "nine hundred eighty-one million, eight hundred fifty-two thousand, nine hundred twenty-one".