102403681 has 2 divisors, whose sum is σ = 102403682. Its totient is φ = 102403680.

The previous prime is 102403661. The next prime is 102403709. The reversal of 102403681 is 186304201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102333456 + 70225 = 10116^2 + 265^2 .

It is an emirp because it is prime and its reverse (186304201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102403681 - 2¹¹ = 102401633 is a prime.

It is a super-2 number, since 2×102403681² = 20973027764699522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (102403661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51201840 + 51201841.

It is an arithmetic number, because the mean of its divisors is an integer number (51201841).

Almost surely, 2^102403681 is an apocalyptic number.

It is an amenable number.

102403681 is a deficient number, since it is larger than the sum of its proper divisors (1).

102403681 is an equidigital number, since it uses as much as digits as its factorization.

102403681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 102403681 is about 10119.4703912804. The cubic root of 102403681 is about 467.8484439371.

Adding to 102403681 its reverse (186304201), we get a palindrome (288707882).

The spelling of 102403681 in words is "one hundred two million, four hundred three thousand, six hundred eighty-one".