621809471 has 2 divisors, whose sum is σ = 621809472. Its totient is φ = 621809470.

The previous prime is 621809467. The next prime is 621809497. The reversal of 621809471 is 174908126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621809471 - 2² = 621809467 is a prime.

It is a super-3 number, since 3×621809471³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621802471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310904735 + 310904736.

It is an arithmetic number, because the mean of its divisors is an integer number (310904736).

Almost surely, 2^621809471 is an apocalyptic number.

621809471 is a deficient number, since it is larger than the sum of its proper divisors (1).

621809471 is an equidigital number, since it uses as much as digits as its factorization.

621809471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 621809471 is about 24936.1077756734. The cubic root of 621809471 is about 853.5306299206.

The spelling of 621809471 in words is "six hundred twenty-one million, eight hundred nine thousand, four hundred seventy-one".