1001811002 has 4 divisors (see below), whose sum is σ = 1502716506. Its totient is φ = 500905500.

The previous prime is 1001810989. The next prime is 1001811007. The reversal of 1001811002 is 2001181001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2001181001 = 37 ⋅54085973.

It can be written as a sum of positive squares in only one way, i.e., 532178761 + 469632241 = 23069^2 + 21671^2 .

It is not an unprimeable number, because it can be changed into a prime (1001811007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250452749 + ... + 250452752.

Almost surely, 2^1001811002 is an apocalyptic number.

1001811002 is a deficient number, since it is larger than the sum of its proper divisors (500905504).

1001811002 is an equidigital number, since it uses as much as digits as its factorization.

1001811002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500905503.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 1001811002 is about 31651.3981049811. The cubic root of 1001811002 is about 1000.6033032853.

Adding to 1001811002 its reverse (2001181001), we get a palindrome (3002992003).

The spelling of 1001811002 in words is "one billion, one million, eight hundred eleven thousand, two".