131211001 has 4 divisors (see below), whose sum is σ = 131378512. Its totient is φ = 131043492.

The previous prime is 131210999. The next prime is 131211007. The reversal of 131211001 is 100112131.

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 131211001 - 2¹ = 131210999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131211007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82575 + ... + 84148.

It is an arithmetic number, because the mean of its divisors is an integer number (32844628).

Almost surely, 2^131211001 is an apocalyptic number.

It is an amenable number.

131211001 is a deficient number, since it is larger than the sum of its proper divisors (167511).

131211001 is an equidigital number, since it uses as much as digits as its factorization.

131211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167510.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 131211001 is about 11454.7370550354. The cubic root of 131211001 is about 508.1478388923.

Adding to 131211001 its reverse (100112131), we get a palindrome (231323132).

The spelling of 131211001 in words is "one hundred thirty-one million, two hundred eleven thousand, one".