659428981 has 2 divisors, whose sum is σ = 659428982. Its totient is φ = 659428980.

The previous prime is 659428961. The next prime is 659429011. The reversal of 659428981 is 189824956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 484396081 + 175032900 = 22009^2 + 13230^2 .

It is a cyclic number.

It is not a de Polignac number, because 659428981 - 2⁵ = 659428949 is a prime.

It is a super-2 number, since 2×659428981² = 869693161965396722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (659428921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329714490 + 329714491.

It is an arithmetic number, because the mean of its divisors is an integer number (329714491).

Almost surely, 2^659428981 is an apocalyptic number.

It is an amenable number.

659428981 is a deficient number, since it is larger than the sum of its proper divisors (1).

659428981 is an equidigital number, since it uses as much as digits as its factorization.

659428981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 52.

The square root of 659428981 is about 25679.3493102921. The cubic root of 659428981 is about 870.4076043966.

The spelling of 659428981 in words is "six hundred fifty-nine million, four hundred twenty-eight thousand, nine hundred eighty-one".