102809791 has 16 divisors (see below), whose sum is σ = 123150400. Its totient is φ = 85730400.

The previous prime is 102809789. The next prime is 102809809. The reversal of 102809791 is 197908201.

It is not a de Polignac number, because 102809791 - 2¹ = 102809789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102809791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102809711) 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, 8641 + ... + 16741.

It is an arithmetic number, because the mean of its divisors is an integer number (7696900).

Almost surely, 2^102809791 is an apocalyptic number.

102809791 is a deficient number, since it is larger than the sum of its proper divisors (20340609).

102809791 is an frugal number, since it uses more digits than its factorization.

102809791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8159 (or 8145 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 102809791 is about 10139.5163099627. The cubic root of 102809791 is about 468.4660887932.

The spelling of 102809791 in words is "one hundred two million, eight hundred nine thousand, seven hundred ninety-one".