102700561 has 4 divisors (see below), whose sum is σ = 104107492. Its totient is φ = 101293632.

The previous prime is 102700523. The next prime is 102700573. The reversal of 102700561 is 165007201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66520336 + 36180225 = 8156^2 + 6015^2 .

It is not a de Polignac number, because 102700561 - 2²¹ = 100603409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102700501) 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, 703356 + ... + 703501.

It is an arithmetic number, because the mean of its divisors is an integer number (26026873).

Almost surely, 2^102700561 is an apocalyptic number.

It is an amenable number.

102700561 is a deficient number, since it is larger than the sum of its proper divisors (1406931).

102700561 is an equidigital number, since it uses as much as digits as its factorization.

102700561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406930.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 102700561 is about 10134.1285269134. The cubic root of 102700561 is about 468.3001231360.

Adding to 102700561 its reverse (165007201), we get a palindrome (267707762).

The spelling of 102700561 in words is "one hundred two million, seven hundred thousand, five hundred sixty-one".