102809025 has 36 divisors (see below), whose sum is σ = 200887440. Its totient is φ = 49845600.

The previous prime is 102809023. The next prime is 102809027. The reversal of 102809025 is 520908201.

It is an interprime number because it is at equal distance from previous prime (102809023) and next prime (102809027).

It is not a de Polignac number, because 102809025 - 2¹ = 102809023 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 102809025.

It is not an unprimeable number, because it can be changed into a prime (102809023) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18295 + ... + 23244.

Almost surely, 2^102809025 is an apocalyptic number.

102809025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

102809025 is a deficient number, since it is larger than the sum of its proper divisors (98078415).

102809025 is a wasteful number, since it uses less digits than its factorization.

102809025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41566 (or 41558 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 102809025 is about 10139.4785368874. The cubic root of 102809025 is about 468.4649253310.

The spelling of 102809025 in words is "one hundred two million, eight hundred nine thousand, twenty-five".