811671849 has 24 divisors (see below), whose sum is σ = 1267485440. Its totient is φ = 498775968.

The previous prime is 811671821. The next prime is 811671893. The reversal of 811671849 is 948176118.

It is a happy number.

It is not a de Polignac number, because 811671849 - 2⁹ = 811671337 is a prime.

It is a super-2 number, since 2×811671849² = 1317622380918157602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (811671149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57817 + ... + 70470.

Almost surely, 2^811671849 is an apocalyptic number.

It is an amenable number.

811671849 is a deficient number, since it is larger than the sum of its proper divisors (455813591).

811671849 is a wasteful number, since it uses less digits than its factorization.

811671849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128349 (or 128346 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 811671849 is about 28489.8551944372. The cubic root of 811671849 is about 932.8106472914.

It can be divided in two parts, 81 and 1671849, that multiplied together give a square (135419769 = 11637²).

The spelling of 811671849 in words is "eight hundred eleven million, six hundred seventy-one thousand, eight hundred forty-nine".