647062091 has 8 divisors (see below), whose sum is σ = 697974144. Its totient is φ = 596312640.

The previous prime is 647062057. The next prime is 647062099. The reversal of 647062091 is 190260746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 647062091 - 2²² = 642867787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647062099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32315 + ... + 48356.

It is an arithmetic number, because the mean of its divisors is an integer number (87246768).

Almost surely, 2^647062091 is an apocalyptic number.

647062091 is a deficient number, since it is larger than the sum of its proper divisors (50912053).

647062091 is a wasteful number, since it uses less digits than its factorization.

647062091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81301.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 647062091 is about 25437.4151792198. The cubic root of 647062091 is about 864.9320409482.

The spelling of 647062091 in words is "six hundred forty-seven million, sixty-two thousand, ninety-one".