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64921 is a prime number
BaseRepresentation
bin1111110110011001
310022001111
433312121
54034141
61220321
7360163
oct176631
9108044
1064921
114485a
12316a1
132371c
1419933
1514381
hexfd99

64921 has 2 divisors, whose sum is σ = 64922. Its totient is φ = 64920.

The previous prime is 64919. The next prime is 64927. The reversal of 64921 is 12946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38025 + 26896 = 195^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 64921 - 21 = 64919 is a prime.

Together with 64919, it forms a pair of twin primes.

64921 is a lucky number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 64892 and 64901.

It is not a weakly prime, because it can be changed into another prime (64927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32460 + 32461.

It is an arithmetic number, because the mean of its divisors is an integer number (32461).

264921 is an apocalyptic number.

It is an amenable number.

64921 is a deficient number, since it is larger than the sum of its proper divisors (1).

64921 is an equidigital number, since it uses as much as digits as its factorization.

64921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 64921 is about 254.7959968288. The cubic root of 64921 is about 40.1909618882.

The spelling of 64921 in words is "sixty-four thousand, nine hundred twenty-one".