102185557 has 2 divisors, whose sum is σ = 102185558. Its totient is φ = 102185556.

The previous prime is 102185509. The next prime is 102185593. The reversal of 102185557 is 755581201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64657681 + 37527876 = 8041^2 + 6126^2 .

It is a cyclic number.

It is not a de Polignac number, because 102185557 - 2¹⁵ = 102152789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102185507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51092778 + 51092779.

It is an arithmetic number, because the mean of its divisors is an integer number (51092779).

Almost surely, 2^102185557 is an apocalyptic number.

It is an amenable number.

102185557 is a deficient number, since it is larger than the sum of its proper divisors (1).

102185557 is an equidigital number, since it uses as much as digits as its factorization.

102185557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14000, while the sum is 34.

The square root of 102185557 is about 10108.6872045781. The cubic root of 102185557 is about 467.5160290766.

The spelling of 102185557 in words is "one hundred two million, one hundred eighty-five thousand, five hundred fifty-seven".