621090550009 has 2 divisors, whose sum is σ = 621090550010. Its totient is φ = 621090550008.

The previous prime is 621090550001. The next prime is 621090550027. The reversal of 621090550009 is 900055090126.

621090550009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402437984400 + 218652565609 = 634380^2 + 467603^2 .

It is a cyclic number.

It is not a de Polignac number, because 621090550009 - 2³ = 621090550001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621090550009.

It is not a weakly prime, because it can be changed into another prime (621090550001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310545275004 + 310545275005.

It is an arithmetic number, because the mean of its divisors is an integer number (310545275005).

Almost surely, 2^621090550009 is an apocalyptic number.

It is an amenable number.

621090550009 is a deficient number, since it is larger than the sum of its proper divisors (1).

621090550009 is an equidigital number, since it uses as much as digits as its factorization.

621090550009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 37.

The spelling of 621090550009 in words is "six hundred twenty-one billion, ninety million, five hundred fifty thousand, nine".