649179961 has 2 divisors, whose sum is σ = 649179962. Its totient is φ = 649179960.

The previous prime is 649179953. The next prime is 649180031. The reversal of 649179961 is 169971946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585882025 + 63297936 = 24205^2 + 7956^2 .

It is a cyclic number.

It is not a de Polignac number, because 649179961 - 2³ = 649179953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 649179899 and 649179908.

It is not a weakly prime, because it can be changed into another prime (649179361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324589980 + 324589981.

It is an arithmetic number, because the mean of its divisors is an integer number (324589981).

Almost surely, 2^649179961 is an apocalyptic number.

It is an amenable number.

649179961 is a deficient number, since it is larger than the sum of its proper divisors (1).

649179961 is an equidigital number, since it uses as much as digits as its factorization.

649179961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 52.

The square root of 649179961 is about 25479.0102044801. The cubic root of 649179961 is about 865.8746700667.

The spelling of 649179961 in words is "six hundred forty-nine million, one hundred seventy-nine thousand, nine hundred sixty-one".