12621541 has 2 divisors, whose sum is σ = 12621542. Its totient is φ = 12621540.

The previous prime is 12621533. The next prime is 12621547. The reversal of 12621541 is 14512621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12496225 + 125316 = 3535^2 + 354^2 .

It is a cyclic number.

It is not a de Polignac number, because 12621541 - 2³ = 12621533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12621547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6310770 + 6310771.

It is an arithmetic number, because the mean of its divisors is an integer number (6310771).

Almost surely, 2^12621541 is an apocalyptic number.

It is an amenable number.

12621541 is a deficient number, since it is larger than the sum of its proper divisors (1).

12621541 is an equidigital number, since it uses as much as digits as its factorization.

12621541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 22.

The square root of 12621541 is about 3552.6808187621. The cubic root of 12621541 is about 232.8292079747.

The spelling of 12621541 in words is "twelve million, six hundred twenty-one thousand, five hundred forty-one".