648405193 has 2 divisors, whose sum is σ = 648405194. Its totient is φ = 648405192.

The previous prime is 648405101. The next prime is 648405217. The reversal of 648405193 is 391504846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 647040969 + 1364224 = 25437^2 + 1168^2 .

It is a cyclic number.

It is not a de Polignac number, because 648405193 - 2²¹ = 646308041 is a prime.

It is not a weakly prime, because it can be changed into another prime (648405493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324202596 + 324202597.

It is an arithmetic number, because the mean of its divisors is an integer number (324202597).

Almost surely, 2^648405193 is an apocalyptic number.

It is an amenable number.

648405193 is a deficient number, since it is larger than the sum of its proper divisors (1).

648405193 is an equidigital number, since it uses as much as digits as its factorization.

648405193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 648405193 is about 25463.8016211248. The cubic root of 648405193 is about 865.5300717112.

The spelling of 648405193 in words is "six hundred forty-eight million, four hundred five thousand, one hundred ninety-three".