648545109 has 4 divisors (see below), whose sum is σ = 864726816. Its totient is φ = 432363404.

The previous prime is 648545101. The next prime is 648545111. The reversal of 648545109 is 901545846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 648545109 - 2³ = 648545101 is a prime.

It is a super-2 number, since 2×648545109² = 841221516815643762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648545101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108090849 + ... + 108090854.

It is an arithmetic number, because the mean of its divisors is an integer number (216181704).

Almost surely, 2^648545109 is an apocalyptic number.

It is an amenable number.

648545109 is a deficient number, since it is larger than the sum of its proper divisors (216181707).

648545109 is a wasteful number, since it uses less digits than its factorization.

648545109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216181706.

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 648545109 is about 25466.5488238984. The cubic root of 648545109 is about 865.5923233183.

The spelling of 648545109 in words is "six hundred forty-eight million, five hundred forty-five thousand, one hundred nine".