621216067 has 2 divisors, whose sum is σ = 621216068. Its totient is φ = 621216066.

The previous prime is 621216059. The next prime is 621216083. The reversal of 621216067 is 760612126.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621216067 - 2³ = 621216059 is a prime.

It is a Chen prime.

It is equal to p_32373436 and since 621216067 and 32373436 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (621216097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310608033 + 310608034.

It is an arithmetic number, because the mean of its divisors is an integer number (310608034).

Almost surely, 2^621216067 is an apocalyptic number.

621216067 is a deficient number, since it is larger than the sum of its proper divisors (1).

621216067 is an equidigital number, since it uses as much as digits as its factorization.

621216067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 621216067 is about 24924.2064467457. The cubic root of 621216067 is about 853.2590302769.

The spelling of 621216067 in words is "six hundred twenty-one million, two hundred sixteen thousand, sixty-seven".