1001243011 has 4 divisors (see below), whose sum is σ = 1001625912. Its totient is φ = 1000860112.

The previous prime is 1001242987. The next prime is 1001243029. The reversal of 1001243011 is 1103421001.

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 1001243011 - 2⁷ = 1001242883 is a prime.

It is a super-2 number, since 2×1001243011² = 2004975134152692242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001242982 and 1001243000.

It is not an unprimeable number, because it can be changed into a prime (1001243071) 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, 187501 + ... + 192766.

It is an arithmetic number, because the mean of its divisors is an integer number (250406478).

Almost surely, 2^1001243011 is an apocalyptic number.

1001243011 is a deficient number, since it is larger than the sum of its proper divisors (382901).

1001243011 is an equidigital number, since it uses as much as digits as its factorization.

1001243011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382900.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1001243011 is about 31642.4242276094. The cubic root of 1001243011 is about 1000.4141654433.

Adding to 1001243011 its reverse (1103421001), we get a palindrome (2104664012).

The spelling of 1001243011 in words is "one billion, one million, two hundred forty-three thousand, eleven".