131001421 has 2 divisors, whose sum is σ = 131001422. Its totient is φ = 131001420.

The previous prime is 131001419. The next prime is 131001433. The reversal of 131001421 is 124100131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126112900 + 4888521 = 11230^2 + 2211^2 .

It is an emirp because it is prime and its reverse (124100131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131001421 - 2¹ = 131001419 is a prime.

It is a super-2 number, since 2×131001421² = 34322744608038482, which contains 22 as substring.

Together with 131001419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131001821) 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 as a sum of consecutive naturals, namely, 65500710 + 65500711.

It is an arithmetic number, because the mean of its divisors is an integer number (65500711).

Almost surely, 2^131001421 is an apocalyptic number.

It is an amenable number.

131001421 is a deficient number, since it is larger than the sum of its proper divisors (1).

131001421 is an equidigital number, since it uses as much as digits as its factorization.

131001421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 131001421 is about 11445.5852187645. The cubic root of 131001421 is about 507.8771441700.

Adding to 131001421 its reverse (124100131), we get a palindrome (255101552).

The spelling of 131001421 in words is "one hundred thirty-one million, one thousand, four hundred twenty-one".