131641621 has 2 divisors, whose sum is σ = 131641622. Its totient is φ = 131641620.

The previous prime is 131641607. The next prime is 131641661. The reversal of 131641621 is 126146131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110019121 + 21622500 = 10489^2 + 4650^2 .

It is a cyclic number.

It is not a de Polignac number, because 131641621 - 2⁹ = 131641109 is a prime.

It is a super-3 number, since 3×131641621³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131641661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65820810 + 65820811.

It is an arithmetic number, because the mean of its divisors is an integer number (65820811).

Almost surely, 2^131641621 is an apocalyptic number.

It is an amenable number.

131641621 is a deficient number, since it is larger than the sum of its proper divisors (1).

131641621 is an equidigital number, since it uses as much as digits as its factorization.

131641621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 131641621 is about 11473.5182485583. The cubic root of 131641621 is about 508.7031268806.

Adding to 131641621 its reverse (126146131), we get a palindrome (257787752).

The spelling of 131641621 in words is "one hundred thirty-one million, six hundred forty-one thousand, six hundred twenty-one".