102809461 has 8 divisors (see below), whose sum is σ = 104699648. Its totient is φ = 100926000.

The previous prime is 102809459. The next prime is 102809503. The reversal of 102809461 is 164908201.

It is a happy number.

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 102809461 - 2¹ = 102809459 is a prime.

It is a super-2 number, since 2×102809461² = 21139570542221042, which contains 22 as substring.

It is the 10140-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102809401) by changing a digit.

It is a nontrivial repunit in base 10139.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37156 + ... + 39826.

It is an arithmetic number, because the mean of its divisors is an integer number (13087456).

Almost surely, 2^102809461 is an apocalyptic number.

It is an amenable number.

102809461 is a deficient number, since it is larger than the sum of its proper divisors (1890187).

102809461 is an equidigital number, since it uses as much as digits as its factorization.

102809461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3363.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 102809461 is about 10139.5000369841. The cubic root of 102809461 is about 468.4655875635.

The spelling of 102809461 in words is "one hundred two million, eight hundred nine thousand, four hundred sixty-one".