102161557 has 2 divisors, whose sum is σ = 102161558. Its totient is φ = 102161556.

The previous prime is 102161539. The next prime is 102161569. The reversal of 102161557 is 755161201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94984516 + 7177041 = 9746^2 + 2679^2 .

It is an emirp because it is prime and its reverse (755161201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102161557 - 2¹⁹ = 101637269 is a prime.

It is the 10108-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102161057) by changing a digit.

It is a nontrivial repunit in base 10107.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51080778 + 51080779.

It is an arithmetic number, because the mean of its divisors is an integer number (51080779).

Almost surely, 2^102161557 is an apocalyptic number.

It is an amenable number.

102161557 is a deficient number, since it is larger than the sum of its proper divisors (1).

102161557 is an equidigital number, since it uses as much as digits as its factorization.

102161557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 102161557 is about 10107.5000371012. The cubic root of 102161557 is about 467.4794248716.

The spelling of 102161557 in words is "one hundred two million, one hundred sixty-one thousand, five hundred fifty-seven".