647431355 has 4 divisors (see below), whose sum is σ = 776917632. Its totient is φ = 517945080.

The previous prime is 647431313. The next prime is 647431361. The reversal of 647431355 is 553134746.

647431355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-647431355 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64743131 + ... + 64743140.

It is an arithmetic number, because the mean of its divisors is an integer number (194229408).

Almost surely, 2^647431355 is an apocalyptic number.

647431355 is a deficient number, since it is larger than the sum of its proper divisors (129486277).

647431355 is a wasteful number, since it uses less digits than its factorization.

647431355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129486276.

The product of its digits is 151200, while the sum is 38.

The square root of 647431355 is about 25444.6724286244. The cubic root of 647431355 is about 865.0965421777.

The spelling of 647431355 in words is "six hundred forty-seven million, four hundred thirty-one thousand, three hundred fifty-five".