102006557 has 2 divisors, whose sum is σ = 102006558. Its totient is φ = 102006556.

The previous prime is 102006539. The next prime is 102006559. The reversal of 102006557 is 755600201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51681721 + 50324836 = 7189^2 + 7094^2 .

It is a cyclic number.

It is not a de Polignac number, because 102006557 - 2⁶ = 102006493 is a prime.

Together with 102006559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102006559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51003278 + 51003279.

It is an arithmetic number, because the mean of its divisors is an integer number (51003279).

Almost surely, 2^102006557 is an apocalyptic number.

It is an amenable number.

102006557 is a deficient number, since it is larger than the sum of its proper divisors (1).

102006557 is an equidigital number, since it uses as much as digits as its factorization.

102006557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 102006557 is about 10099.8295530172. The cubic root of 102006557 is about 467.2428845359.

Adding to 102006557 its reverse (755600201), we get a palindrome (857606758).

The spelling of 102006557 in words is "one hundred two million, six thousand, five hundred fifty-seven".