102405561 has 8 divisors (see below), whose sum is σ = 137616384. Its totient is φ = 67732560.

The previous prime is 102405557. The next prime is 102405571. The reversal of 102405561 is 165504201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 102405561 - 2² = 102405557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102405521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134010 + ... + 134771.

It is an arithmetic number, because the mean of its divisors is an integer number (17202048).

Almost surely, 2^102405561 is an apocalyptic number.

It is an amenable number.

102405561 is a deficient number, since it is larger than the sum of its proper divisors (35210823).

102405561 is a wasteful number, since it uses less digits than its factorization.

102405561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268911.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 102405561 is about 10119.5632810907. The cubic root of 102405561 is about 467.8513069517.

Adding to 102405561 its reverse (165504201), we get a palindrome (267909762).

The spelling of 102405561 in words is "one hundred two million, four hundred five thousand, five hundred sixty-one".