12621751 has 4 divisors (see below), whose sum is σ = 12781600. Its totient is φ = 12461904.

The previous prime is 12621731. The next prime is 12621767. The reversal of 12621751 is 15712621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12621751 - 2²¹ = 10524599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79806 + ... + 79963.

It is an arithmetic number, because the mean of its divisors is an integer number (3195400).

Almost surely, 2^12621751 is an apocalyptic number.

12621751 is a deficient number, since it is larger than the sum of its proper divisors (159849).

12621751 is an equidigital number, since it uses as much as digits as its factorization.

12621751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159848.

The product of its digits is 840, while the sum is 25.

The square root of 12621751 is about 3552.7103737851. The cubic root of 12621751 is about 232.8304992555.

The spelling of 12621751 in words is "twelve million, six hundred twenty-one thousand, seven hundred fifty-one".