513977221 has 4 divisors (see below), whose sum is σ = 516413344. Its totient is φ = 511541100.

The previous prime is 513977207. The next prime is 513977231. The reversal of 513977221 is 122779315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513977221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513977231) 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, 1217745 + ... + 1218166.

It is an arithmetic number, because the mean of its divisors is an integer number (129103336).

Almost surely, 2^513977221 is an apocalyptic number.

It is an amenable number.

513977221 is a deficient number, since it is larger than the sum of its proper divisors (2436123).

513977221 is a wasteful number, since it uses less digits than its factorization.

513977221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436122.

The product of its digits is 26460, while the sum is 37.

The square root of 513977221 is about 22671.0657226342. The cubic root of 513977221 is about 801.0284798241.

The spelling of 513977221 in words is "five hundred thirteen million, nine hundred seventy-seven thousand, two hundred twenty-one".