648452291 has 4 divisors (see below), whose sum is σ = 650793552. Its totient is φ = 646111032.

The previous prime is 648452263. The next prime is 648452293. The reversal of 648452291 is 192254846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648452291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648452293) 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, 1170215 + ... + 1170768.

It is an arithmetic number, because the mean of its divisors is an integer number (162698388).

Almost surely, 2^648452291 is an apocalyptic number.

648452291 is a deficient number, since it is larger than the sum of its proper divisors (2341261).

648452291 is a wasteful number, since it uses less digits than its factorization.

648452291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341260.

The product of its digits is 138240, while the sum is 41.

The square root of 648452291 is about 25464.7264073267. The cubic root of 648452291 is about 865.5510276139.

The spelling of 648452291 in words is "six hundred forty-eight million, four hundred fifty-two thousand, two hundred ninety-one".