548665961 has 2 divisors, whose sum is σ = 548665962. Its totient is φ = 548665960.

The previous prime is 548665951. The next prime is 548666003. The reversal of 548665961 is 169566845.

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., 285610000 + 263055961 = 16900^2 + 16219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-548665961 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (548665951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274332980 + 274332981.

It is an arithmetic number, because the mean of its divisors is an integer number (274332981).

Almost surely, 2^548665961 is an apocalyptic number.

It is an amenable number.

548665961 is a deficient number, since it is larger than the sum of its proper divisors (1).

548665961 is an equidigital number, since it uses as much as digits as its factorization.

548665961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 50.

The square root of 548665961 is about 23423.6197245430. The cubic root of 548665961 is about 818.6583060999.

The spelling of 548665961 in words is "five hundred forty-eight million, six hundred sixty-five thousand, nine hundred sixty-one".