261068993 has 2 divisors, whose sum is σ = 261068994. Its totient is φ = 261068992.

The previous prime is 261068989. The next prime is 261069013. The reversal of 261068993 is 399860162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244234384 + 16834609 = 15628^2 + 4103^2 .

It is a cyclic number.

It is not a de Polignac number, because 261068993 - 2² = 261068989 is a prime.

It is not a weakly prime, because it can be changed into another prime (261068903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130534496 + 130534497.

It is an arithmetic number, because the mean of its divisors is an integer number (130534497).

Almost surely, 2^261068993 is an apocalyptic number.

It is an amenable number.

261068993 is a deficient number, since it is larger than the sum of its proper divisors (1).

261068993 is an equidigital number, since it uses as much as digits as its factorization.

261068993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 261068993 is about 16157.6295600561. The cubic root of 261068993 is about 639.1239584723.

The spelling of 261068993 in words is "two hundred sixty-one million, sixty-eight thousand, nine hundred ninety-three".