621146881 has 2 divisors, whose sum is σ = 621146882. Its totient is φ = 621146880.

The previous prime is 621146873. The next prime is 621146891. The reversal of 621146881 is 188641126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 615833856 + 5313025 = 24816^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 621146881 - 2³ = 621146873 is a prime.

It is a super-2 number, since 2×621146881² = 771646895552056322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 621146881.

It is not a weakly prime, because it can be changed into another prime (621146821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310573440 + 310573441.

It is an arithmetic number, because the mean of its divisors is an integer number (310573441).

Almost surely, 2^621146881 is an apocalyptic number.

It is an amenable number.

621146881 is a deficient number, since it is larger than the sum of its proper divisors (1).

621146881 is an equidigital number, since it uses as much as digits as its factorization.

621146881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 37.

The square root of 621146881 is about 24922.8184802602. The cubic root of 621146881 is about 853.2273527473.

The spelling of 621146881 in words is "six hundred twenty-one million, one hundred forty-six thousand, eight hundred eighty-one".