102561111 has 12 divisors (see below), whose sum is σ = 148236192. Its totient is φ = 68331456.

The previous prime is 102561103. The next prime is 102561127. The reversal of 102561111 is 111165201.

It is a happy number.

102561111 is a `hidden beast` number, since 102 + 561 + 1 + 1 + 1 = 666.

It is not a de Polignac number, because 102561111 - 2³ = 102561103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102561211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19695 + ... + 24351.

It is an arithmetic number, because the mean of its divisors is an integer number (12353016).

Almost surely, 2^102561111 is an apocalyptic number.

102561111 is a deficient number, since it is larger than the sum of its proper divisors (45675081).

102561111 is a wasteful number, since it uses less digits than its factorization.

102561111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110 (or 7107 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

The square root of 102561111 is about 10127.2459731163. The cubic root of 102561111 is about 468.0880696629.

The spelling of 102561111 in words is "one hundred two million, five hundred sixty-one thousand, one hundred eleven".