647125231 has 2 divisors, whose sum is σ = 647125232. Its totient is φ = 647125230.

The previous prime is 647125211. The next prime is 647125249. The reversal of 647125231 is 132521746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647125231 - 2¹³ = 647117039 is a prime.

It is a super-2 number, since 2×647125231² = 837542129193606722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 647125193 and 647125202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647125211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323562615 + 323562616.

It is an arithmetic number, because the mean of its divisors is an integer number (323562616).

Almost surely, 2^647125231 is an apocalyptic number.

647125231 is a deficient number, since it is larger than the sum of its proper divisors (1).

647125231 is an equidigital number, since it uses as much as digits as its factorization.

647125231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 647125231 is about 25438.6562341646. The cubic root of 647125231 is about 864.9601732473.

Adding to 647125231 its reverse (132521746), we get a palindrome (779646977).

The spelling of 647125231 in words is "six hundred forty-seven million, one hundred twenty-five thousand, two hundred thirty-one".