2001312091 has 2 divisors, whose sum is σ = 2001312092. Its totient is φ = 2001312090.

The previous prime is 2001312059. The next prime is 2001312107. The reversal of 2001312091 is 1902131002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2001312091 - 2⁵ = 2001312059 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001312031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000656045 + 1000656046.

It is an arithmetic number, because the mean of its divisors is an integer number (1000656046).

Almost surely, 2^2001312091 is an apocalyptic number.

2001312091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001312091 is an equidigital number, since it uses as much as digits as its factorization.

2001312091 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 19.

The square root of 2001312091 is about 44736.0267681429. The cubic root of 2001312091 is about 1260.1965115102.

Adding to 2001312091 its reverse (1902131002), we get a palindrome (3903443093).

The spelling of 2001312091 in words is "two billion, one million, three hundred twelve thousand, ninety-one".