647814977 has 2 divisors, whose sum is σ = 647814978. Its totient is φ = 647814976.

The previous prime is 647814949. The next prime is 647814991. The reversal of 647814977 is 779418746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 424730881 + 223084096 = 20609^2 + 14936^2 .

It is a cyclic number.

It is not a de Polignac number, because 647814977 - 2⁶ = 647814913 is a prime.

It is not a weakly prime, because it can be changed into another prime (647214977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323907488 + 323907489.

It is an arithmetic number, because the mean of its divisors is an integer number (323907489).

Almost surely, 2^647814977 is an apocalyptic number.

It is an amenable number.

647814977 is a deficient number, since it is larger than the sum of its proper divisors (1).

647814977 is an equidigital number, since it uses as much as digits as its factorization.

647814977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2370816, while the sum is 53.

The square root of 647814977 is about 25452.2096683176. The cubic root of 647814977 is about 865.2673734363.

The spelling of 647814977 in words is "six hundred forty-seven million, eight hundred fourteen thousand, nine hundred seventy-seven".