261524089 has 2 divisors, whose sum is σ = 261524090. Its totient is φ = 261524088.

The previous prime is 261524083. The next prime is 261524111. The reversal of 261524089 is 980425162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241274089 + 20250000 = 15533^2 + 4500^2 .

It is a cyclic number.

It is not a de Polignac number, because 261524089 - 2¹³ = 261515897 is a prime.

It is not a weakly prime, because it can be changed into another prime (261524083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130762044 + 130762045.

It is an arithmetic number, because the mean of its divisors is an integer number (130762045).

Almost surely, 2^261524089 is an apocalyptic number.

It is an amenable number.

261524089 is a deficient number, since it is larger than the sum of its proper divisors (1).

261524089 is an equidigital number, since it uses as much as digits as its factorization.

261524089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 261524089 is about 16171.7064343872. The cubic root of 261524089 is about 639.4951169494.

The spelling of 261524089 in words is "two hundred sixty-one million, five hundred twenty-four thousand, eighty-nine".