261141521 has 2 divisors, whose sum is σ = 261141522. Its totient is φ = 261141520.

The previous prime is 261141511. The next prime is 261141527. The reversal of 261141521 is 125141162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226201600 + 34939921 = 15040^2 + 5911^2 .

It is a cyclic number.

It is not a de Polignac number, because 261141521 - 2²² = 256947217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261141527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130570760 + 130570761.

It is an arithmetic number, because the mean of its divisors is an integer number (130570761).

Almost surely, 2^261141521 is an apocalyptic number.

It is an amenable number.

261141521 is a deficient number, since it is larger than the sum of its proper divisors (1).

261141521 is an equidigital number, since it uses as much as digits as its factorization.

261141521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 23.

The square root of 261141521 is about 16159.8737928240. The cubic root of 261141521 is about 639.1831383465.

Adding to 261141521 its reverse (125141162), we get a palindrome (386282683).

The spelling of 261141521 in words is "two hundred sixty-one million, one hundred forty-one thousand, five hundred twenty-one".