102861947 has 2 divisors, whose sum is σ = 102861948. Its totient is φ = 102861946.

The previous prime is 102861943. The next prime is 102861949. The reversal of 102861947 is 749168201.

It is a strong prime.

It is an emirp because it is prime and its reverse (749168201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102861947 - 2² = 102861943 is a prime.

Together with 102861949, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102861947.

It is not a weakly prime, because it can be changed into another prime (102861943) 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, 51430973 + 51430974.

It is an arithmetic number, because the mean of its divisors is an integer number (51430974).

Almost surely, 2^102861947 is an apocalyptic number.

102861947 is a deficient number, since it is larger than the sum of its proper divisors (1).

102861947 is an equidigital number, since it uses as much as digits as its factorization.

102861947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 102861947 is about 10142.0879014136. The cubic root of 102861947 is about 468.5452939173.

The spelling of 102861947 in words is "one hundred two million, eight hundred sixty-one thousand, nine hundred forty-seven".