647375149 has 4 divisors (see below), whose sum is σ = 669698460. Its totient is φ = 625051840.

The previous prime is 647375143. The next prime is 647375161. The reversal of 647375149 is 941573746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 335146249 + 312228900 = 18307^2 + 17670^2 .

It is a cyclic number.

It is not a de Polignac number, because 647375149 - 2¹⁹ = 646850861 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647375099 and 647375108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647375143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11161612 + ... + 11161669.

It is an arithmetic number, because the mean of its divisors is an integer number (167424615).

Almost surely, 2^647375149 is an apocalyptic number.

It is an amenable number.

647375149 is a deficient number, since it is larger than the sum of its proper divisors (22323311).

647375149 is a wasteful number, since it uses less digits than its factorization.

647375149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22323310.

The product of its digits is 635040, while the sum is 46.

The square root of 647375149 is about 25443.5679298325. The cubic root of 647375149 is about 865.0715073365.

The spelling of 647375149 in words is "six hundred forty-seven million, three hundred seventy-five thousand, one hundred forty-nine".