131001001 has 4 divisors (see below), whose sum is σ = 133472772. Its totient is φ = 128529232.

The previous prime is 131000951. The next prime is 131001011. The reversal of 131001001 is 100100131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62094400 + 68906601 = 7880^2 + 8301^2 .

It is a cyclic number.

It is not a de Polignac number, because 131001001 - 2¹¹ = 130998953 is a prime.

It is a super-2 number, since 2×131001001² = 34322524526004002, which contains 22 as substring.

It is a Duffinian number.

131001001 is a modest number, since divided by 1001 gives 131 as remainder.

It is not an unprimeable number, because it can be changed into a prime (131001011) 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, 1235806 + ... + 1235911.

It is an arithmetic number, because the mean of its divisors is an integer number (33368193).

Almost surely, 2^131001001 is an apocalyptic number.

It is an amenable number.

131001001 is a deficient number, since it is larger than the sum of its proper divisors (2471771).

131001001 is an equidigital number, since it uses as much as digits as its factorization.

131001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471770.

The product of its (nonzero) digits is 3, while the sum is 7.

The square root of 131001001 is about 11445.5668710641. The cubic root of 131001001 is about 507.8766014059.

Adding to 131001001 its reverse (100100131), we get a palindrome (231101132).

The spelling of 131001001 in words is "one hundred thirty-one million, one thousand, one".