648605501 has 2 divisors, whose sum is σ = 648605502. Its totient is φ = 648605500.

The previous prime is 648605491. The next prime is 648605509. The reversal of 648605501 is 105506846.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575520100 + 73085401 = 23990^2 + 8549^2 .

It is a cyclic number.

It is not a de Polignac number, because 648605501 - 2¹⁰ = 648604477 is a prime.

It is a super-2 number, since 2×648605501² = 841378191854922002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648605509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324302750 + 324302751.

It is an arithmetic number, because the mean of its divisors is an integer number (324302751).

Almost surely, 2^648605501 is an apocalyptic number.

It is an amenable number.

648605501 is a deficient number, since it is larger than the sum of its proper divisors (1).

648605501 is an equidigital number, since it uses as much as digits as its factorization.

648605501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 648605501 is about 25467.7345085895. The cubic root of 648605501 is about 865.6191902385.

The spelling of 648605501 in words is "six hundred forty-eight million, six hundred five thousand, five hundred one".