261215527 has 2 divisors, whose sum is σ = 261215528. Its totient is φ = 261215526.

The previous prime is 261215503. The next prime is 261215561. The reversal of 261215527 is 725512162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261215527 - 2²⁷ = 126997799 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261215567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130607763 + 130607764.

It is an arithmetic number, because the mean of its divisors is an integer number (130607764).

Almost surely, 2^261215527 is an apocalyptic number.

261215527 is a deficient number, since it is larger than the sum of its proper divisors (1).

261215527 is an equidigital number, since it uses as much as digits as its factorization.

261215527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 31.

The square root of 261215527 is about 16162.1634381044. The cubic root of 261215527 is about 639.2435129145.

Adding to 261215527 its reverse (725512162), we get a palindrome (986727689).

The spelling of 261215527 in words is "two hundred sixty-one million, two hundred fifteen thousand, five hundred twenty-seven".