620055421 has 2 divisors, whose sum is σ = 620055422. Its totient is φ = 620055420.

The previous prime is 620055407. The next prime is 620055451. The reversal of 620055421 is 124550026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 602162521 + 17892900 = 24539^2 + 4230^2 .

It is a cyclic number.

It is not a de Polignac number, because 620055421 - 2²¹ = 617958269 is a prime.

It is a super-2 number, since 2×620055421² = 768937450222974482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620055451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310027710 + 310027711.

It is an arithmetic number, because the mean of its divisors is an integer number (310027711).

Almost surely, 2^620055421 is an apocalyptic number.

It is an amenable number.

620055421 is a deficient number, since it is larger than the sum of its proper divisors (1).

620055421 is an equidigital number, since it uses as much as digits as its factorization.

620055421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 620055421 is about 24900.9120515695. The cubic root of 620055421 is about 852.7273048786.

The spelling of 620055421 in words is "six hundred twenty million, fifty-five thousand, four hundred twenty-one".