648430961 has 2 divisors, whose sum is σ = 648430962. Its totient is φ = 648430960.

The previous prime is 648430933. The next prime is 648430967. The reversal of 648430961 is 169034846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 424360000 + 224070961 = 20600^2 + 14969^2 .

It is a cyclic number.

It is not a de Polignac number, because 648430961 - 2⁶ = 648430897 is a prime.

It is a super-2 number, since 2×648430961² = 840925422366767042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (648430967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324215480 + 324215481.

It is an arithmetic number, because the mean of its divisors is an integer number (324215481).

Almost surely, 2^648430961 is an apocalyptic number.

It is an amenable number.

648430961 is a deficient number, since it is larger than the sum of its proper divisors (1).

648430961 is an equidigital number, since it uses as much as digits as its factorization.

648430961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 648430961 is about 25464.3075892513. The cubic root of 648430961 is about 865.5415371157.

The spelling of 648430961 in words is "six hundred forty-eight million, four hundred thirty thousand, nine hundred sixty-one".