647032231 has 4 divisors (see below), whose sum is σ = 651755232. Its totient is φ = 642309232.

The previous prime is 647032219. The next prime is 647032241. The reversal of 647032231 is 132230746.

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-647032231 is a prime.

It is a super-2 number, since 2×647032231² = 837301415905674722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647032231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647032201) 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, 2361295 + ... + 2361568.

It is an arithmetic number, because the mean of its divisors is an integer number (162938808).

Almost surely, 2^647032231 is an apocalyptic number.

647032231 is a deficient number, since it is larger than the sum of its proper divisors (4723001).

647032231 is a wasteful number, since it uses less digits than its factorization.

647032231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4723000.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 647032231 is about 25436.8282417443. The cubic root of 647032231 is about 864.9187360592.

Adding to 647032231 its reverse (132230746), we get a palindrome (779262977).

The spelling of 647032231 in words is "six hundred forty-seven million, thirty-two thousand, two hundred thirty-one".