513541421 has 2 divisors, whose sum is σ = 513541422. Its totient is φ = 513541420.

The previous prime is 513541403. The next prime is 513541453. The reversal of 513541421 is 124145315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 355134025 + 158407396 = 18845^2 + 12586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513541421 is a prime.

It is a super-4 number, since 4×513541421⁴ (a number of 36 digits) contains 4444 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513541121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256770710 + 256770711.

It is an arithmetic number, because the mean of its divisors is an integer number (256770711).

Almost surely, 2^513541421 is an apocalyptic number.

It is an amenable number.

513541421 is a deficient number, since it is larger than the sum of its proper divisors (1).

513541421 is an equidigital number, since it uses as much as digits as its factorization.

513541421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 26.

The square root of 513541421 is about 22661.4523144480. The cubic root of 513541421 is about 800.8020191255.

Adding to 513541421 its reverse (124145315), we get a palindrome (637686736).

The spelling of 513541421 in words is "five hundred thirteen million, five hundred forty-one thousand, four hundred twenty-one".