12621979 has 2 divisors, whose sum is σ = 12621980. Its totient is φ = 12621978.

The previous prime is 12621977. The next prime is 12621997. The reversal of 12621979 is 97912621.

Together with next prime (12621997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12621979 - 2¹ = 12621977 is a prime.

Together with 12621977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12621971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6310989 + 6310990.

It is an arithmetic number, because the mean of its divisors is an integer number (6310990).

Almost surely, 2^12621979 is an apocalyptic number.

12621979 is a deficient number, since it is larger than the sum of its proper divisors (1).

12621979 is an equidigital number, since it uses as much as digits as its factorization.

12621979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 12621979 is about 3552.7424618173. The cubic root of 12621979 is about 232.8319012014.

The spelling of 12621979 in words is "twelve million, six hundred twenty-one thousand, nine hundred seventy-nine".