1012005191 has 2 divisors, whose sum is σ = 1012005192. Its totient is φ = 1012005190.

The previous prime is 1012005187. The next prime is 1012005217. The reversal of 1012005191 is 1915002101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1012005191 - 2² = 1012005187 is a prime.

It is a super-2 number, since 2×1012005191² = 2048309013221892962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012005131) 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, 506002595 + 506002596.

It is an arithmetic number, because the mean of its divisors is an integer number (506002596).

Almost surely, 2^1012005191 is an apocalyptic number.

1012005191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012005191 is an equidigital number, since it uses as much as digits as its factorization.

1012005191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 1012005191 is about 31812.0290299126. The cubic root of 1012005191 is about 1003.9858224455.

Adding to 1012005191 its reverse (1915002101), we get a palindrome (2927007292).

The spelling of 1012005191 in words is "one billion, twelve million, five thousand, one hundred ninety-one".