231001009 has 2 divisors, whose sum is σ = 231001010. Its totient is φ = 231001008.

The previous prime is 231001003. The next prime is 231001019. The reversal of 231001009 is 900100132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180633600 + 50367409 = 13440^2 + 7097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231001009 is a prime.

It is a super-2 number, since 2×231001009² = 106722932318036162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231000983 and 231001001.

It is not a weakly prime, because it can be changed into another prime (231001003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115500504 + 115500505.

It is an arithmetic number, because the mean of its divisors is an integer number (115500505).

Almost surely, 2^231001009 is an apocalyptic number.

It is an amenable number.

231001009 is a deficient number, since it is larger than the sum of its proper divisors (1).

231001009 is an equidigital number, since it uses as much as digits as its factorization.

231001009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 231001009 is about 15198.7173471974. The cubic root of 231001009 is about 613.5801373292.

The spelling of 231001009 in words is "two hundred thirty-one million, one thousand, nine".