10505020091 has 2 divisors, whose sum is σ = 10505020092. Its totient is φ = 10505020090.

The previous prime is 10505020039. The next prime is 10505020109. The reversal of 10505020091 is 19002050501.

Together with next prime (10505020109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10505020091 - 2¹⁸ = 10504757947 is a prime.

It is a super-2 number, since 2×10505020091² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10505028091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252510045 + 5252510046.

It is an arithmetic number, because the mean of its divisors is an integer number (5252510046).

Almost surely, 2^10505020091 is an apocalyptic number.

10505020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

10505020091 is an equidigital number, since it uses as much as digits as its factorization.

10505020091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 23.

Adding to 10505020091 its reverse (19002050501), we get a palindrome (29507070592).

The spelling of 10505020091 in words is "ten billion, five hundred five million, twenty thousand, ninety-one".