102791987 has 2 divisors, whose sum is σ = 102791988. Its totient is φ = 102791986.

The previous prime is 102791959. The next prime is 102792023. The reversal of 102791987 is 789197201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102791987 - 2¹⁶ = 102726451 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102791947) 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, 51395993 + 51395994.

It is an arithmetic number, because the mean of its divisors is an integer number (51395994).

Almost surely, 2^102791987 is an apocalyptic number.

102791987 is a deficient number, since it is larger than the sum of its proper divisors (1).

102791987 is an equidigital number, since it uses as much as digits as its factorization.

102791987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 44.

The square root of 102791987 is about 10138.6383208003. The cubic root of 102791987 is about 468.4390451570.

The spelling of 102791987 in words is "one hundred two million, seven hundred ninety-one thousand, nine hundred eighty-seven".