811901481 has 8 divisors (see below), whose sum is σ = 1089705024. Its totient is φ = 537682800.

The previous prime is 811901477. The next prime is 811901491. The reversal of 811901481 is 184109118.

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

It is not a de Polignac number, because 811901481 - 2² = 811901477 is a prime.

It is a super-2 number, since 2×811901481² = 1318368029699986722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (811901491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 895686 + ... + 896591.

It is an arithmetic number, because the mean of its divisors is an integer number (136213128).

Almost surely, 2^811901481 is an apocalyptic number.

It is an amenable number.

811901481 is a deficient number, since it is larger than the sum of its proper divisors (277803543).

811901481 is a wasteful number, since it uses less digits than its factorization.

811901481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792431.

The product of its (nonzero) digits is 2304, while the sum is 33.

The square root of 811901481 is about 28493.8849755522. The cubic root of 811901481 is about 932.8986068848.

The spelling of 811901481 in words is "eight hundred eleven million, nine hundred one thousand, four hundred eighty-one".