12621967 has 2 divisors, whose sum is σ = 12621968. Its totient is φ = 12621966.

The previous prime is 12621949. The next prime is 12621971. The reversal of 12621967 is 76912621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12621967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12621977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6310983 + 6310984.

It is an arithmetic number, because the mean of its divisors is an integer number (6310984).

Almost surely, 2^12621967 is an apocalyptic number.

12621967 is a deficient number, since it is larger than the sum of its proper divisors (1).

12621967 is an equidigital number, since it uses as much as digits as its factorization.

12621967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 12621967 is about 3552.7407729808. The cubic root of 12621967 is about 232.8318274152.

The spelling of 12621967 in words is "twelve million, six hundred twenty-one thousand, nine hundred sixty-seven".