102157705 has 8 divisors (see below), whose sum is σ = 132019272. Its totient is φ = 75439488.

The previous prime is 102157669. The next prime is 102157717. The reversal of 102157705 is 507751201.

It can be written as a sum of positive squares in 4 ways, for example, as 3433609 + 98724096 = 1853^2 + 9936^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 102157705 - 2⁷ = 102157577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 785764 + ... + 785893.

It is an arithmetic number, because the mean of its divisors is an integer number (16502409).

Almost surely, 2^102157705 is an apocalyptic number.

It is an amenable number.

102157705 is a deficient number, since it is larger than the sum of its proper divisors (29861567).

102157705 is a wasteful number, since it uses less digits than its factorization.

102157705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571675.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 102157705 is about 10107.3094837350. The cubic root of 102157705 is about 467.4735493628.

The spelling of 102157705 in words is "one hundred two million, one hundred fifty-seven thousand, seven hundred five".