811685145 has 16 divisors (see below), whose sum is σ = 1375090560. Its totient is φ = 407433984.

The previous prime is 811685143. The next prime is 811685167. The reversal of 811685145 is 541586118.

It is not a de Polignac number, because 811685145 - 2¹ = 811685143 is a prime.

It is a super-2 number, since 2×811685145² = 1317665549227342050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (811685141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1591285 + ... + 1591794.

It is an arithmetic number, because the mean of its divisors is an integer number (85943160).

Almost surely, 2^811685145 is an apocalyptic number.

811685145 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

811685145 is a deficient number, since it is larger than the sum of its proper divisors (563405415).

811685145 is a wasteful number, since it uses less digits than its factorization.

811685145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183104.

The product of its digits is 38400, while the sum is 39.

The square root of 811685145 is about 28490.0885397010. The cubic root of 811685145 is about 932.8157407220.

The spelling of 811685145 in words is "eight hundred eleven million, six hundred eighty-five thousand, one hundred forty-five".