261370633 has 2 divisors, whose sum is σ = 261370634. Its totient is φ = 261370632.

The previous prime is 261370607. The next prime is 261370651. The reversal of 261370633 is 336073162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232501504 + 28869129 = 15248^2 + 5373^2 .

It is a cyclic number.

It is not a de Polignac number, because 261370633 - 2²¹ = 259273481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261370595 and 261370604.

It is not a weakly prime, because it can be changed into another prime (261370673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130685316 + 130685317.

It is an arithmetic number, because the mean of its divisors is an integer number (130685317).

Almost surely, 2^261370633 is an apocalyptic number.

It is an amenable number.

261370633 is a deficient number, since it is larger than the sum of its proper divisors (1).

261370633 is an equidigital number, since it uses as much as digits as its factorization.

261370633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 31.

The square root of 261370633 is about 16166.9611553934. The cubic root of 261370633 is about 639.3700123958.

The spelling of 261370633 in words is "two hundred sixty-one million, three hundred seventy thousand, six hundred thirty-three".