102020252591 has 2 divisors, whose sum is σ = 102020252592. Its totient is φ = 102020252590.

The previous prime is 102020252549. The next prime is 102020252599. The reversal of 102020252591 is 195252020201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102020252591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102020252599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010126295 + 51010126296.

It is an arithmetic number, because the mean of its divisors is an integer number (51010126296).

Almost surely, 2^102020252591 is an apocalyptic number.

102020252591 is a deficient number, since it is larger than the sum of its proper divisors (1).

102020252591 is an equidigital number, since it uses as much as digits as its factorization.

102020252591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 102020252591 its reverse (195252020201), we get a palindrome (297272272792).

The spelling of 102020252591 in words is "one hundred two billion, twenty million, two hundred fifty-two thousand, five hundred ninety-one".