102565381 has 2 divisors, whose sum is σ = 102565382. Its totient is φ = 102565380.

The previous prime is 102565361. The next prime is 102565417. The reversal of 102565381 is 183565201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55368481 + 47196900 = 7441^2 + 6870^2 .

It is a cyclic number.

It is not a de Polignac number, because 102565381 - 2¹⁵ = 102532613 is a prime.

It is a super-2 number, since 2×102565381² = 21039314759350322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102565361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51282690 + 51282691.

It is an arithmetic number, because the mean of its divisors is an integer number (51282691).

Almost surely, 2^102565381 is an apocalyptic number.

It is an amenable number.

102565381 is a deficient number, since it is larger than the sum of its proper divisors (1).

102565381 is an equidigital number, since it uses as much as digits as its factorization.

102565381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 102565381 is about 10127.4567883551. The cubic root of 102565381 is about 468.0945656544.

The spelling of 102565381 in words is "one hundred two million, five hundred sixty-five thousand, three hundred eighty-one".