647412145 has 4 divisors (see below), whose sum is σ = 776894580. Its totient is φ = 517929712.

The previous prime is 647412113. The next prime is 647412179. The reversal of 647412145 is 541214746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541214746 = 2 ⋅270607373.

It can be written as a sum of positive squares in 2 ways, for example, as 279424656 + 367987489 = 16716^2 + 19183^2 .

It is a cyclic number.

It is not a de Polignac number, because 647412145 - 2⁵ = 647412113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647412145.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64741210 + ... + 64741219.

It is an arithmetic number, because the mean of its divisors is an integer number (194223645).

Almost surely, 2^647412145 is an apocalyptic number.

It is an amenable number.

647412145 is a deficient number, since it is larger than the sum of its proper divisors (129482435).

647412145 is a wasteful number, since it uses less digits than its factorization.

647412145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129482434.

The product of its digits is 26880, while the sum is 34.

The square root of 647412145 is about 25444.2949401236. The cubic root of 647412145 is about 865.0879859713.

It can be divided in two parts, 64741 and 2145, that multiplied together give a triangular number (138869445 = T₁₆₆₆₅).

The spelling of 647412145 in words is "six hundred forty-seven million, four hundred twelve thousand, one hundred forty-five".