1001013231 has 4 divisors (see below), whose sum is σ = 1334684312. Its totient is φ = 667342152.

The previous prime is 1001013151. The next prime is 1001013239. The reversal of 1001013231 is 1323101001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1323101001 = 3 ⋅441033667.

It is not a de Polignac number, because 1001013231 - 2²⁵ = 967458799 is a prime.

It is a super-2 number, since 2×1001013231² = 2004054977274118722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001013239) 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, 166835536 + ... + 166835541.

It is an arithmetic number, because the mean of its divisors is an integer number (333671078).

Almost surely, 2^1001013231 is an apocalyptic number.

1001013231 is a deficient number, since it is larger than the sum of its proper divisors (333671081).

1001013231 is an equidigital number, since it uses as much as digits as its factorization.

1001013231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333671080.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 1001013231 is about 31638.7931343786. The cubic root of 1001013231 is about 1000.3376296601.

Adding to 1001013231 its reverse (1323101001), we get a palindrome (2324114232).

The spelling of 1001013231 in words is "one billion, one million, thirteen thousand, two hundred thirty-one".