513145649 has 4 divisors (see below), whose sum is σ = 514268964. Its totient is φ = 512022336.

The previous prime is 513145643. The next prime is 513145651. The reversal of 513145649 is 946541315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946541315 = 5 ⋅189308263.

It can be written as a sum of positive squares in 2 ways, for example, as 405297424 + 107848225 = 20132^2 + 10385^2 .

It is a cyclic number.

It is not a de Polignac number, because 513145649 - 2⁸ = 513145393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513145643) 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, 560972 + ... + 561885.

It is an arithmetic number, because the mean of its divisors is an integer number (128567241).

Almost surely, 2^513145649 is an apocalyptic number.

It is an amenable number.

513145649 is a deficient number, since it is larger than the sum of its proper divisors (1123315).

513145649 is a wasteful number, since it uses less digits than its factorization.

513145649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123314.

The product of its digits is 64800, while the sum is 38.

The square root of 513145649 is about 22652.7183578484. The cubic root of 513145649 is about 800.5962476880.

The spelling of 513145649 in words is "five hundred thirteen million, one hundred forty-five thousand, six hundred forty-nine".