102790861 has 2 divisors, whose sum is σ = 102790862. Its totient is φ = 102790860.

The previous prime is 102790859. The next prime is 102790867. The reversal of 102790861 is 168097201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79316836 + 23474025 = 8906^2 + 4845^2 .

It is a cyclic number.

It is not a de Polignac number, because 102790861 - 2¹ = 102790859 is a prime.

It is a super-2 number, since 2×102790861² = 21131922210242642, which contains 22 as substring.

Together with 102790859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102790867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51395430 + 51395431.

It is an arithmetic number, because the mean of its divisors is an integer number (51395431).

Almost surely, 2^102790861 is an apocalyptic number.

It is an amenable number.

102790861 is a deficient number, since it is larger than the sum of its proper divisors (1).

102790861 is an equidigital number, since it uses as much as digits as its factorization.

102790861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 102790861 is about 10138.5827905087. The cubic root of 102790861 is about 468.4373346985.

The spelling of 102790861 in words is "one hundred two million, seven hundred ninety thousand, eight hundred sixty-one".