102813805 has 8 divisors (see below), whose sum is σ = 124163352. Its totient is φ = 81726528.

The previous prime is 102813803. The next prime is 102813811. The reversal of 102813805 is 508318201.

It can be written as a sum of positive squares in 4 ways, for example, as 20331081 + 82482724 = 4509^2 + 9082^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 102813805 - 2¹ = 102813803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102813803) 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, 64702 + ... + 66271.

It is an arithmetic number, because the mean of its divisors is an integer number (15520419).

Almost surely, 2^102813805 is an apocalyptic number.

It is an amenable number.

102813805 is a deficient number, since it is larger than the sum of its proper divisors (21349547).

102813805 is a wasteful number, since it uses less digits than its factorization.

102813805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131135.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 102813805 is about 10139.7142464667. The cubic root of 102813805 is about 468.4721854836.

The spelling of 102813805 in words is "one hundred two million, eight hundred thirteen thousand, eight hundred five".