811371493 has 4 divisors (see below), whose sum is σ = 811450080. Its totient is φ = 811292908.

The previous prime is 811371487. The next prime is 811371499. The reversal of 811371493 is 394173118.

811371493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (811371487) and next prime (811371499).

It is a cyclic number.

It is not a de Polignac number, because 811371493 - 2¹⁷ = 811240421 is a prime.

It is a super-3 number, since 3×811371493³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811371499) 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, 20953 + ... + 45406.

It is an arithmetic number, because the mean of its divisors is an integer number (202862520).

Almost surely, 2^811371493 is an apocalyptic number.

It is an amenable number.

811371493 is a deficient number, since it is larger than the sum of its proper divisors (78587).

811371493 is a wasteful number, since it uses less digits than its factorization.

811371493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78586.

The product of its digits is 18144, while the sum is 37.

The square root of 811371493 is about 28484.5834268293. The cubic root of 811371493 is about 932.6955721160.

The spelling of 811371493 in words is "eight hundred eleven million, three hundred seventy-one thousand, four hundred ninety-three".