102805485631 has 4 divisors (see below), whose sum is σ = 102837445792. Its totient is φ = 102773525472.

The previous prime is 102805485593. The next prime is 102805485661. The reversal of 102805485631 is 136584508201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136584508201 = 1229 ⋅111134669.

It is a cyclic number.

It is not a de Polignac number, because 102805485631 - 2⁹ = 102805485119 is a prime.

It is a super-2 number, since 2×102805485631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102805485661) 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, 15975255 + ... + 15981688.

It is an arithmetic number, because the mean of its divisors is an integer number (25709361448).

Almost surely, 2^102805485631 is an apocalyptic number.

102805485631 is a deficient number, since it is larger than the sum of its proper divisors (31960161).

102805485631 is an equidigital number, since it uses as much as digits as its factorization.

102805485631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31960160.

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 102805485631 in words is "one hundred two billion, eight hundred five million, four hundred eighty-five thousand, six hundred thirty-one".