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621679 is a prime number
BaseRepresentation
bin10010111110001101111
31011120210011
42113301233
5124343204
621154051
75166322
oct2276157
91146704
10621679
11395093
1225b927
13189c76
141227b9
15c4304
hex97c6f

621679 has 2 divisors, whose sum is σ = 621680. Its totient is φ = 621678.

The previous prime is 621671. The next prime is 621697. The reversal of 621679 is 976126.

Together with next prime (621697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621679 - 23 = 621671 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621679.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310839 + 310840.

It is an arithmetic number, because the mean of its divisors is an integer number (310840).

2621679 is an apocalyptic number.

621679 is a deficient number, since it is larger than the sum of its proper divisors (1).

621679 is an equidigital number, since it uses as much as digits as its factorization.

621679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 621679 is about 788.4662326314. The cubic root of 621679 is about 85.3470928469.

The spelling of 621679 in words is "six hundred twenty-one thousand, six hundred seventy-nine".