261670481 has 2 divisors, whose sum is σ = 261670482. Its totient is φ = 261670480.

The previous prime is 261670441. The next prime is 261670537. The reversal of 261670481 is 184076162.

261670481 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 can be written as a sum of positive squares in only one way, i.e., 256288081 + 5382400 = 16009^2 + 2320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261670481 is a prime.

It is a super-2 number, since 2×261670481² = 136942881253542722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (261670421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130835240 + 130835241.

It is an arithmetic number, because the mean of its divisors is an integer number (130835241).

Almost surely, 2^261670481 is an apocalyptic number.

It is an amenable number.

261670481 is a deficient number, since it is larger than the sum of its proper divisors (1).

261670481 is an equidigital number, since it uses as much as digits as its factorization.

261670481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 261670481 is about 16176.2319778124. The cubic root of 261670481 is about 639.6144169944.

The spelling of 261670481 in words is "two hundred sixty-one million, six hundred seventy thousand, four hundred eighty-one".