102143857 has 4 divisors (see below), whose sum is σ = 102179556. Its totient is φ = 102108160.

The previous prime is 102143843. The next prime is 102143861. The reversal of 102143857 is 758341201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95179536 + 6964321 = 9756^2 + 2639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102143857 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102143827) 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, 13144 + ... + 19417.

It is an arithmetic number, because the mean of its divisors is an integer number (25544889).

Almost surely, 2^102143857 is an apocalyptic number.

It is an amenable number.

102143857 is a deficient number, since it is larger than the sum of its proper divisors (35699).

102143857 is an equidigital number, since it uses as much as digits as its factorization.

102143857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35698.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 102143857 is about 10106.6244117410. The cubic root of 102143857 is about 467.4524255972.

The spelling of 102143857 in words is "one hundred two million, one hundred forty-three thousand, eight hundred fifty-seven".