102648561 has 4 divisors (see below), whose sum is σ = 136864752. Its totient is φ = 68432372.

The previous prime is 102648551. The next prime is 102648577. The reversal of 102648561 is 165846201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102648561 - 2⁷ = 102648433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102648521) 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, 17108091 + ... + 17108096.

It is an arithmetic number, because the mean of its divisors is an integer number (34216188).

Almost surely, 2^102648561 is an apocalyptic number.

It is an amenable number.

102648561 is a deficient number, since it is larger than the sum of its proper divisors (34216191).

102648561 is an equidigital number, since it uses as much as digits as its factorization.

102648561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34216190.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 102648561 is about 10131.5626139308. The cubic root of 102648561 is about 468.2210722289.

The spelling of 102648561 in words is "one hundred two million, six hundred forty-eight thousand, five hundred sixty-one".