131065621 has 2 divisors, whose sum is σ = 131065622. Its totient is φ = 131065620.

The previous prime is 131065619. The next prime is 131065673. The reversal of 131065621 is 126560131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96314596 + 34751025 = 9814^2 + 5895^2 .

It is a cyclic number.

It is not a de Polignac number, because 131065621 - 2¹ = 131065619 is a prime.

Together with 131065619, 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 (131065321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65532810 + 65532811.

It is an arithmetic number, because the mean of its divisors is an integer number (65532811).

Almost surely, 2^131065621 is an apocalyptic number.

It is an amenable number.

131065621 is a deficient number, since it is larger than the sum of its proper divisors (1).

131065621 is an equidigital number, since it uses as much as digits as its factorization.

131065621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 131065621 is about 11448.3894500493. The cubic root of 131065621 is about 507.9600959108.

The spelling of 131065621 in words is "one hundred thirty-one million, sixty-five thousand, six hundred twenty-one".