647801231 has 16 divisors (see below), whose sum is σ = 819030528. Its totient is φ = 497666400.

The previous prime is 647801171. The next prime is 647801239. The reversal of 647801231 is 132108746.

It is not a de Polignac number, because 647801231 - 2¹⁰ = 647800207 is a prime.

It is a super-2 number, since 2×647801231² = 839292869770230722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647801239) 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, 53780 + ... + 64713.

It is an arithmetic number, because the mean of its divisors is an integer number (51189408).

Almost surely, 2^647801231 is an apocalyptic number.

647801231 is a deficient number, since it is larger than the sum of its proper divisors (171229297).

647801231 is a wasteful number, since it uses less digits than its factorization.

647801231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118582.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 647801231 is about 25451.9396313916. The cubic root of 647801231 is about 865.2612533506.

Adding to 647801231 its reverse (132108746), we get a palindrome (779909977).

The spelling of 647801231 in words is "six hundred forty-seven million, eight hundred one thousand, two hundred thirty-one".