647961471 has 16 divisors (see below), whose sum is σ = 993045600. Its totient is φ = 417078144.

The previous prime is 647961467. The next prime is 647961487. The reversal of 647961471 is 174169746.

It is not a de Polignac number, because 647961471 - 2² = 647961467 is a prime.

It is a super-3 number, since 3×647961471³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647961401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412986 + ... + 414551.

It is an arithmetic number, because the mean of its divisors is an integer number (62065350).

Almost surely, 2^647961471 is an apocalyptic number.

647961471 is a deficient number, since it is larger than the sum of its proper divisors (345084129).

647961471 is a wasteful number, since it uses less digits than its factorization.

647961471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827575 (or 827569 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 647961471 is about 25455.0873304336. The cubic root of 647961471 is about 865.3325910934.

The spelling of 647961471 in words is "six hundred forty-seven million, nine hundred sixty-one thousand, four hundred seventy-one".