621146819 has 2 divisors, whose sum is σ = 621146820. Its totient is φ = 621146818.

The previous prime is 621146797. The next prime is 621146821. The reversal of 621146819 is 918641126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621146819 - 2²⁰ = 620098243 is a prime.

It is a super-2 number, since 2×621146819² = 771646741507637522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 621146821, 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 (621148819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310573409 + 310573410.

It is an arithmetic number, because the mean of its divisors is an integer number (310573410).

Almost surely, 2^621146819 is an apocalyptic number.

621146819 is a deficient number, since it is larger than the sum of its proper divisors (1).

621146819 is an equidigital number, since it uses as much as digits as its factorization.

621146819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 621146819 is about 24922.8172364201. The cubic root of 621146819 is about 853.2273243589.

The spelling of 621146819 in words is "six hundred twenty-one million, one hundred forty-six thousand, eight hundred nineteen".