513661421 has 16 divisors (see below), whose sum is σ = 632755200. Its totient is φ = 406055808.

The previous prime is 513661403. The next prime is 513661433. The reversal of 513661421 is 124166315.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 513661421 - 2¹⁰ = 513660397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513661441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158465 + ... + 161673.

It is an arithmetic number, because the mean of its divisors is an integer number (39547200).

Almost surely, 2^513661421 is an apocalyptic number.

It is an amenable number.

513661421 is a deficient number, since it is larger than the sum of its proper divisors (119093779).

513661421 is a wasteful number, since it uses less digits than its factorization.

513661421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4988.

The product of its digits is 4320, while the sum is 29.

The square root of 513661421 is about 22664.0998277011. The cubic root of 513661421 is about 800.8643891404.

The spelling of 513661421 in words is "five hundred thirteen million, six hundred sixty-one thousand, four hundred twenty-one".