513506261 has 2 divisors, whose sum is σ = 513506262. Its totient is φ = 513506260.

The previous prime is 513506243. The next prime is 513506281. The reversal of 513506261 is 162605315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 507105361 + 6400900 = 22519^2 + 2530^2 .

It is a cyclic number.

It is not a de Polignac number, because 513506261 - 2⁶ = 513506197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513506281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256753130 + 256753131.

It is an arithmetic number, because the mean of its divisors is an integer number (256753131).

Almost surely, 2^513506261 is an apocalyptic number.

It is an amenable number.

513506261 is a deficient number, since it is larger than the sum of its proper divisors (1).

513506261 is an equidigital number, since it uses as much as digits as its factorization.

513506261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 513506261 is about 22660.6765344727. The cubic root of 513506261 is about 800.7837428707.

The spelling of 513506261 in words is "five hundred thirteen million, five hundred six thousand, two hundred sixty-one".