1001945523 has 4 divisors (see below), whose sum is σ = 1335927368. Its totient is φ = 667963680.

The previous prime is 1001945491. The next prime is 1001945531. The reversal of 1001945523 is 3255491001.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1001945523 - 2⁵ = 1001945491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001945543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166990918 + ... + 166990923.

It is an arithmetic number, because the mean of its divisors is an integer number (333981842).

Almost surely, 2^1001945523 is an apocalyptic number.

1001945523 is a deficient number, since it is larger than the sum of its proper divisors (333981845).

1001945523 is an equidigital number, since it uses as much as digits as its factorization.

1001945523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333981844.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1001945523 is about 31653.5230740592. The cubic root of 1001945523 is about 1000.6480875584.

The spelling of 1001945523 in words is "one billion, one million, nine hundred forty-five thousand, five hundred twenty-three".