260128997 has 2 divisors, whose sum is σ = 260128998. Its totient is φ = 260128996.

The previous prime is 260128993. The next prime is 260129017. The reversal of 260128997 is 799821062.

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., 163814401 + 96314596 = 12799^2 + 9814^2 .

It is a cyclic number.

It is not a de Polignac number, because 260128997 - 2² = 260128993 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260128991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130064498 + 130064499.

It is an arithmetic number, because the mean of its divisors is an integer number (130064499).

Almost surely, 2^260128997 is an apocalyptic number.

It is an amenable number.

260128997 is a deficient number, since it is larger than the sum of its proper divisors (1).

260128997 is an equidigital number, since it uses as much as digits as its factorization.

260128997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 260128997 is about 16128.5150277389. The cubic root of 260128997 is about 638.3559667812.

The spelling of 260128997 in words is "two hundred sixty million, one hundred twenty-eight thousand, nine hundred ninety-seven".