261261523 has 2 divisors, whose sum is σ = 261261524. Its totient is φ = 261261522.

The previous prime is 261261503. The next prime is 261261527. The reversal of 261261523 is 325162162.

261261523 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261261523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261261491 and 261261500.

It is not a weakly prime, because it can be changed into another prime (261261527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130630761 + 130630762.

It is an arithmetic number, because the mean of its divisors is an integer number (130630762).

Almost surely, 2^261261523 is an apocalyptic number.

261261523 is a deficient number, since it is larger than the sum of its proper divisors (1).

261261523 is an equidigital number, since it uses as much as digits as its factorization.

261261523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 261261523 is about 16163.5863285349. The cubic root of 261261523 is about 639.2810309994.

The spelling of 261261523 in words is "two hundred sixty-one million, two hundred sixty-one thousand, five hundred twenty-three".