1001231601 has 4 divisors (see below), whose sum is σ = 1334975472. Its totient is φ = 667487732.

The previous prime is 1001231587. The next prime is 1001231611. The reversal of 1001231601 is 1061321001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1001231601 - 2⁹ = 1001231089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001231611) 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, 166871931 + ... + 166871936.

It is an arithmetic number, because the mean of its divisors is an integer number (333743868).

Almost surely, 2^1001231601 is an apocalyptic number.

It is an amenable number.

1001231601 is a deficient number, since it is larger than the sum of its proper divisors (333743871).

1001231601 is an equidigital number, since it uses as much as digits as its factorization.

1001231601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333743870.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1001231601 is about 31642.2439311753. The cubic root of 1001231601 is about 1000.4103652440.

Adding to 1001231601 its reverse (1061321001), we get a palindrome (2062552602).

The spelling of 1001231601 in words is "one billion, one million, two hundred thirty-one thousand, six hundred one".