102644557 has 4 divisors (see below), whose sum is σ = 103211836. Its totient is φ = 102077280.

The previous prime is 102644539. The next prime is 102644573. The reversal of 102644557 is 755446201.

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 1320201 + 101324356 = 1149^2 + 10066^2 .

It is a cyclic number.

It is not a de Polignac number, because 102644557 - 2¹¹ = 102642509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102654557) 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, 283368 + ... + 283729.

It is an arithmetic number, because the mean of its divisors is an integer number (25802959).

Almost surely, 2^102644557 is an apocalyptic number.

It is an amenable number.

102644557 is a deficient number, since it is larger than the sum of its proper divisors (567279).

102644557 is an equidigital number, since it uses as much as digits as its factorization.

102644557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567278.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 102644557 is about 10131.3650116852. The cubic root of 102644557 is about 468.2149842022.

The spelling of 102644557 in words is "one hundred two million, six hundred forty-four thousand, five hundred fifty-seven".