6558961 has 2 divisors, whose sum is σ = 6558962. Its totient is φ = 6558960.

The previous prime is 6558941. The next prime is 6558973. The reversal of 6558961 is 1698556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6471936 + 87025 = 2544^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 6558961 - 2⁹ = 6558449 is a prime.

6558961 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6558911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3279480 + 3279481.

It is an arithmetic number, because the mean of its divisors is an integer number (3279481).

Almost surely, 2^6558961 is an apocalyptic number.

It is an amenable number.

6558961 is a deficient number, since it is larger than the sum of its proper divisors (1).

6558961 is an equidigital number, since it uses as much as digits as its factorization.

6558961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 40.

The square root of 6558961 is about 2561.0468562680. The cubic root of 6558961 is about 187.1881488741.

The spelling of 6558961 in words is "six million, five hundred fifty-eight thousand, nine hundred sixty-one".