513905947 has 4 divisors (see below), whose sum is σ = 515006856. Its totient is φ = 512805040.

The previous prime is 513905933. The next prime is 513906011. The reversal of 513905947 is 749509315.

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

It is a cyclic number.

It is not a de Polignac number, because 513905947 - 2¹⁵ = 513873179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513905747) 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, 549754 + ... + 550687.

It is an arithmetic number, because the mean of its divisors is an integer number (128751714).

Almost surely, 2^513905947 is an apocalyptic number.

513905947 is a deficient number, since it is larger than the sum of its proper divisors (1100909).

513905947 is a wasteful number, since it uses less digits than its factorization.

513905947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100908.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 513905947 is about 22669.4937526183. The cubic root of 513905947 is about 800.9914515015.

The spelling of 513905947 in words is "five hundred thirteen million, nine hundred five thousand, nine hundred forty-seven".