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661328989 is a prime number
BaseRepresentation
bin100111011010110…
…001010001011101
31201002101222211021
4213122301101131
52323300011424
6145342324141
722250126566
oct4732612135
91632358737
10661328989
1130a337292
12165589651
13a701c739
1463b8d16d
153d0d44e4
hex276b145d

661328989 has 2 divisors, whose sum is σ = 661328990. Its totient is φ = 661328988.

The previous prime is 661328971. The next prime is 661329049. The reversal of 661328989 is 989823166.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 483560100 + 177768889 = 21990^2 + 13333^2 .

It is a cyclic number.

It is not a de Polignac number, because 661328989 - 227 = 527111261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661328189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330664494 + 330664495.

It is an arithmetic number, because the mean of its divisors is an integer number (330664495).

Almost surely, 2661328989 is an apocalyptic number.

It is an amenable number.

661328989 is a deficient number, since it is larger than the sum of its proper divisors (1).

661328989 is an equidigital number, since it uses as much as digits as its factorization.

661328989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 52.

The square root of 661328989 is about 25716.3175629793. The cubic root of 661328989 is about 871.2427691902.

The spelling of 661328989 in words is "six hundred sixty-one million, three hundred twenty-eight thousand, nine hundred eighty-nine".