1001945491 has 2 divisors, whose sum is σ = 1001945492. Its totient is φ = 1001945490.

The previous prime is 1001945479. The next prime is 1001945531. The reversal of 1001945491 is 1945491001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1001945491 - 2⁷ = 1001945363 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001945401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500972745 + 500972746.

It is an arithmetic number, because the mean of its divisors is an integer number (500972746).

Almost surely, 2^1001945491 is an apocalyptic number.

1001945491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001945491 is an equidigital number, since it uses as much as digits as its factorization.

1001945491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 1001945491 is about 31653.5225685863. The cubic root of 1001945491 is about 1000.6480769056.

The spelling of 1001945491 in words is "one billion, one million, nine hundred forty-five thousand, four hundred ninety-one".