261145513 has 2 divisors, whose sum is σ = 261145514. Its totient is φ = 261145512.

The previous prime is 261145459. The next prime is 261145529. The reversal of 261145513 is 315541162.

261145513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 260725609 + 419904 = 16147^2 + 648^2 .

It is a cyclic number.

It is not a de Polignac number, because 261145513 - 2¹³ = 261137321 is a prime.

It is equal to p_14255047 and since 261145513 and 14255047 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (261145553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130572756 + 130572757.

It is an arithmetic number, because the mean of its divisors is an integer number (130572757).

Almost surely, 2^261145513 is an apocalyptic number.

It is an amenable number.

261145513 is a deficient number, since it is larger than the sum of its proper divisors (1).

261145513 is an equidigital number, since it uses as much as digits as its factorization.

261145513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 28.

The square root of 261145513 is about 16159.9973081681. The cubic root of 261145513 is about 639.1863953366.

Adding to 261145513 its reverse (315541162), we get a palindrome (576686675).

The spelling of 261145513 in words is "two hundred sixty-one million, one hundred forty-five thousand, five hundred thirteen".