1012320191 has 2 divisors, whose sum is σ = 1012320192. Its totient is φ = 1012320190.

The previous prime is 1012320187. The next prime is 1012320251. The reversal of 1012320191 is 1910232101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1012320191 - 2² = 1012320187 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012320151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506160095 + 506160096.

It is an arithmetic number, because the mean of its divisors is an integer number (506160096).

Almost surely, 2^1012320191 is an apocalyptic number.

1012320191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012320191 is an equidigital number, since it uses as much as digits as its factorization.

1012320191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1012320191 is about 31816.9796020930. The cubic root of 1012320191 is about 1004.0899795946.

Adding to 1012320191 its reverse (1910232101), we get a palindrome (2922552292).

The spelling of 1012320191 in words is "one billion, twelve million, three hundred twenty thousand, one hundred ninety-one".