12920819 has 2 divisors, whose sum is σ = 12920820. Its totient is φ = 12920818.

The previous prime is 12920813. The next prime is 12920821. The reversal of 12920819 is 91802921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12920819 - 2⁸ = 12920563 is a prime.

It is a super-2 number, since 2×12920819² = 333895127261522, which contains 22 as substring.

Together with 12920821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12920813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6460409 + 6460410.

It is an arithmetic number, because the mean of its divisors is an integer number (6460410).

Almost surely, 2^12920819 is an apocalyptic number.

12920819 is a deficient number, since it is larger than the sum of its proper divisors (1).

12920819 is an equidigital number, since it uses as much as digits as its factorization.

12920819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12920819 is about 3594.5540752644. The cubic root of 12920819 is about 234.6551089869.

The spelling of 12920819 in words is "twelve million, nine hundred twenty thousand, eight hundred nineteen".