811149478 has 4 divisors (see below), whose sum is σ = 1216724220. Its totient is φ = 405574738.

The previous prime is 811149473. The next prime is 811149491. The reversal of 811149478 is 874941118.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 874941118 = 2 ⋅437470559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811149473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202787368 + ... + 202787371.

It is an arithmetic number, because the mean of its divisors is an integer number (304181055).

Almost surely, 2^811149478 is an apocalyptic number.

811149478 is a deficient number, since it is larger than the sum of its proper divisors (405574742).

811149478 is a wasteful number, since it uses less digits than its factorization.

811149478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405574741.

The product of its digits is 64512, while the sum is 43.

The square root of 811149478 is about 28480.6860521301. The cubic root of 811149478 is about 932.6104934153.

The spelling of 811149478 in words is "eight hundred eleven million, one hundred forty-nine thousand, four hundred seventy-eight".