647051357 has 4 divisors (see below), whose sum is σ = 648143100. Its totient is φ = 645959616.

The previous prime is 647051333. The next prime is 647051369. The reversal of 647051357 is 753150746.

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 413756281 + 233295076 = 20341^2 + 15274^2 .

It is a cyclic number.

It is not a de Polignac number, because 647051357 - 2¹⁶ = 646985821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647051357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647051257) 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, 544982 + ... + 546167.

It is an arithmetic number, because the mean of its divisors is an integer number (162035775).

Almost surely, 2^647051357 is an apocalyptic number.

It is an amenable number.

647051357 is a deficient number, since it is larger than the sum of its proper divisors (1091743).

647051357 is a wasteful number, since it uses less digits than its factorization.

647051357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091742.

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 647051357 is about 25437.2041899262. The cubic root of 647051357 is about 864.9272581863.

The spelling of 647051357 in words is "six hundred forty-seven million, fifty-one thousand, three hundred fifty-seven".