519201421 has 2 divisors, whose sum is σ = 519201422. Its totient is φ = 519201420.

The previous prime is 519201401. The next prime is 519201443. The reversal of 519201421 is 124102915.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 414936900 + 104264521 = 20370^2 + 10211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-519201421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (519201401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259600710 + 259600711.

It is an arithmetic number, because the mean of its divisors is an integer number (259600711).

Almost surely, 2^519201421 is an apocalyptic number.

It is an amenable number.

519201421 is a deficient number, since it is larger than the sum of its proper divisors (1).

519201421 is an equidigital number, since it uses as much as digits as its factorization.

519201421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 519201421 is about 22785.9917712616. The cubic root of 519201421 is about 803.7332911751.

The spelling of 519201421 in words is "five hundred nineteen million, two hundred one thousand, four hundred twenty-one".