102641813 has 2 divisors, whose sum is σ = 102641814. Its totient is φ = 102641812.

The previous prime is 102641809. The next prime is 102641821. The reversal of 102641813 is 318146201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84511249 + 18130564 = 9193^2 + 4258^2 .

It is an emirp because it is prime and its reverse (318146201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102641813 - 2² = 102641809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102641863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51320906 + 51320907.

It is an arithmetic number, because the mean of its divisors is an integer number (51320907).

Almost surely, 2^102641813 is an apocalyptic number.

It is an amenable number.

102641813 is a deficient number, since it is larger than the sum of its proper divisors (1).

102641813 is an equidigital number, since it uses as much as digits as its factorization.

102641813 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 26.

The square root of 102641813 is about 10131.2295897388. The cubic root of 102641813 is about 468.2108118966.

The spelling of 102641813 in words is "one hundred two million, six hundred forty-one thousand, eight hundred thirteen".