102055391 has 2 divisors, whose sum is σ = 102055392. Its totient is φ = 102055390.

The previous prime is 102055381. The next prime is 102055397. The reversal of 102055391 is 193550201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102055391 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102055391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102055397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51027695 + 51027696.

It is an arithmetic number, because the mean of its divisors is an integer number (51027696).

Almost surely, 2^102055391 is an apocalyptic number.

102055391 is a deficient number, since it is larger than the sum of its proper divisors (1).

102055391 is an equidigital number, since it uses as much as digits as its factorization.

102055391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 102055391 is about 10102.2468292950. The cubic root of 102055391 is about 467.3174343149.

The spelling of 102055391 in words is "one hundred two million, fifty-five thousand, three hundred ninety-one".