261435971 has 2 divisors, whose sum is σ = 261435972. Its totient is φ = 261435970.

The previous prime is 261435961. The next prime is 261436003. The reversal of 261435971 is 179534162.

261435971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261435971 - 2⁶ = 261435907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261435901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130717985 + 130717986.

It is an arithmetic number, because the mean of its divisors is an integer number (130717986).

Almost surely, 2^261435971 is an apocalyptic number.

261435971 is a deficient number, since it is larger than the sum of its proper divisors (1).

261435971 is an equidigital number, since it uses as much as digits as its factorization.

261435971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 261435971 is about 16168.9817552003. The cubic root of 261435971 is about 639.4232849930.

The spelling of 261435971 in words is "two hundred sixty-one million, four hundred thirty-five thousand, nine hundred seventy-one".