131001121 has 4 divisors (see below), whose sum is σ = 131174932. Its totient is φ = 130827312.

The previous prime is 131001113. The next prime is 131001131. The reversal of 131001121 is 121100131.

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 90041121 + 40960000 = 9489^2 + 6400^2 .

It is a cyclic number.

It is not a de Polignac number, because 131001121 - 2³ = 131001113 is a prime.

It is a super-2 number, since 2×131001121² = 34322587406513282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131001098 and 131001107.

It is not an unprimeable number, because it can be changed into a prime (131001131) 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, 85770 + ... + 87283.

It is an arithmetic number, because the mean of its divisors is an integer number (32793733).

Almost surely, 2^131001121 is an apocalyptic number.

It is an amenable number.

131001121 is a deficient number, since it is larger than the sum of its proper divisors (173811).

131001121 is an equidigital number, since it uses as much as digits as its factorization.

131001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173810.

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

The square root of 131001121 is about 11445.5721132672. The cubic root of 131001121 is about 507.8767564815.

Adding to 131001121 its reverse (121100131), we get a palindrome (252101252).

The spelling of 131001121 in words is "one hundred thirty-one million, one thousand, one hundred twenty-one".