1000645523 has 4 divisors (see below), whose sum is σ = 1000959408. Its totient is φ = 1000331640.

The previous prime is 1000645447. The next prime is 1000645553. The reversal of 1000645523 is 3255460001.

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

It is a cyclic number.

It is not a de Polignac number, because 1000645523 - 2¹⁰ = 1000644499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000645492 and 1000645501.

It is not an unprimeable number, because it can be changed into a prime (1000645553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152111 + ... + 158552.

It is an arithmetic number, because the mean of its divisors is an integer number (250239852).

Almost surely, 2^1000645523 is an apocalyptic number.

1000645523 is a deficient number, since it is larger than the sum of its proper divisors (313885).

1000645523 is an equidigital number, since it uses as much as digits as its factorization.

1000645523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313884.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1000645523 is about 31632.9815698742. The cubic root of 1000645523 is about 1000.2151280499.

The spelling of 1000645523 in words is "one billion, six hundred forty-five thousand, five hundred twenty-three".