647123559 has 16 divisors (see below), whose sum is σ = 872831232. Its totient is φ = 426431808.

The previous prime is 647123557. The next prime is 647123593. The reversal of 647123559 is 955321746.

It is not a de Polignac number, because 647123559 - 2¹ = 647123557 is a prime.

It is a super-2 number, since 2×647123559² = 837537801225652962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 647123559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647123557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197059 + ... + 200315.

It is an arithmetic number, because the mean of its divisors is an integer number (54551952).

Almost surely, 2^647123559 is an apocalyptic number.

647123559 is a deficient number, since it is larger than the sum of its proper divisors (225707673).

647123559 is a wasteful number, since it uses less digits than its factorization.

647123559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006.

The product of its digits is 226800, while the sum is 42.

The square root of 647123559 is about 25438.6233707722. The cubic root of 647123559 is about 864.9594283041.

The spelling of 647123559 in words is "six hundred forty-seven million, one hundred twenty-three thousand, five hundred fifty-nine".