851971481 has 8 divisors (see below), whose sum is σ = 880583424. Its totient is φ = 823430160.

The previous prime is 851971459. The next prime is 851971489. The reversal of 851971481 is 184179158.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851971481 is a prime.

It is a super-2 number, since 2×851971481² = 1451710808874666722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851971489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7466 + ... + 41948.

It is an arithmetic number, because the mean of its divisors is an integer number (110072928).

Almost surely, 2^851971481 is an apocalyptic number.

It is an amenable number.

851971481 is a deficient number, since it is larger than the sum of its proper divisors (28611943).

851971481 is a wasteful number, since it uses less digits than its factorization.

851971481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35311.

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

The square root of 851971481 is about 29188.5505121443. The cubic root of 851971481 is about 948.0000330105. Note that the first 4 decimals are identical.

The spelling of 851971481 in words is "eight hundred fifty-one million, nine hundred seventy-one thousand, four hundred eighty-one".