647977433 has 2 divisors, whose sum is σ = 647977434. Its totient is φ = 647977432.

The previous prime is 647977403. The next prime is 647977439. The reversal of 647977433 is 334779746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453988249 + 193989184 = 21307^2 + 13928^2 .

It is a cyclic number.

It is not a de Polignac number, because 647977433 - 2¹⁴ = 647961049 is a prime.

It is not a weakly prime, because it can be changed into another prime (647977439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323988716 + 323988717.

It is an arithmetic number, because the mean of its divisors is an integer number (323988717).

Almost surely, 2^647977433 is an apocalyptic number.

It is an amenable number.

647977433 is a deficient number, since it is larger than the sum of its proper divisors (1).

647977433 is an equidigital number, since it uses as much as digits as its factorization.

647977433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2667168, while the sum is 50.

The square root of 647977433 is about 25455.4008611139. The cubic root of 647977433 is about 865.3396966215.

The spelling of 647977433 in words is "six hundred forty-seven million, nine hundred seventy-seven thousand, four hundred thirty-three".