261525211 has 2 divisors, whose sum is σ = 261525212. Its totient is φ = 261525210.

The previous prime is 261525179. The next prime is 261525217. The reversal of 261525211 is 112525162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261525211 - 2⁵ = 261525179 is a prime.

It is not a weakly prime, because it can be changed into another prime (261525217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130762605 + 130762606.

It is an arithmetic number, because the mean of its divisors is an integer number (130762606).

Almost surely, 2^261525211 is an apocalyptic number.

261525211 is a deficient number, since it is larger than the sum of its proper divisors (1).

261525211 is an equidigital number, since it uses as much as digits as its factorization.

261525211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 25.

The square root of 261525211 is about 16171.7411245666. The cubic root of 261525211 is about 639.4960314764.

The spelling of 261525211 in words is "two hundred sixty-one million, five hundred twenty-five thousand, two hundred eleven".