647962949 has 2 divisors, whose sum is σ = 647962950. Its totient is φ = 647962948.

The previous prime is 647962943. The next prime is 647963033. The reversal of 647962949 is 949269746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643890625 + 4072324 = 25375^2 + 2018^2 .

It is a cyclic number.

It is not a de Polignac number, because 647962949 - 2⁴ = 647962933 is a prime.

It is a super-4 number, since 4×647962949⁴ (a number of 36 digits) contains 4444 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 647962894 and 647962903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647962943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323981474 + 323981475.

It is an arithmetic number, because the mean of its divisors is an integer number (323981475).

Almost surely, 2^647962949 is an apocalyptic number.

It is an amenable number.

647962949 is a deficient number, since it is larger than the sum of its proper divisors (1).

647962949 is an equidigital number, since it uses as much as digits as its factorization.

647962949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 56.

The square root of 647962949 is about 25455.1163619419. The cubic root of 647962949 is about 865.3332490340. Note that the first 3 decimals are identical.

The spelling of 647962949 in words is "six hundred forty-seven million, nine hundred sixty-two thousand, nine hundred forty-nine".