1231001005 has 8 divisors (see below), whose sum is σ = 1590832152. Its totient is φ = 909046848.

The previous prime is 1231000993. The next prime is 1231001027. The reversal of 1231001005 is 5001001321.

It can be written as a sum of positive squares in 4 ways, for example, as 225540324 + 1005460681 = 15018^2 + 31709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231001005 - 2⁷ = 1231000877 is a prime.

It is a super-2 number, since 2×1231001005² = 3030726948622020050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9469174 + ... + 9469303.

It is an arithmetic number, because the mean of its divisors is an integer number (198854019).

Almost surely, 2^1231001005 is an apocalyptic number.

It is an amenable number.

1231001005 is a deficient number, since it is larger than the sum of its proper divisors (359831147).

1231001005 is a wasteful number, since it uses less digits than its factorization.

1231001005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18938495.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 1231001005 is about 35085.6239078059. The cubic root of 1231001005 is about 1071.7318461819.

Adding to 1231001005 its reverse (5001001321), we get a palindrome (6232002326).

The spelling of 1231001005 in words is "one billion, two hundred thirty-one million, one thousand, five".