261335073 has 4 divisors (see below), whose sum is σ = 348446768. Its totient is φ = 174223380.

The previous prime is 261335057. The next prime is 261335077. The reversal of 261335073 is 370533162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 261335073 - 2⁴ = 261335057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261335073.

It is not an unprimeable number, because it can be changed into a prime (261335077) 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 in 3 ways as a sum of consecutive naturals, for example, 43555843 + ... + 43555848.

It is an arithmetic number, because the mean of its divisors is an integer number (87111692).

Almost surely, 2^261335073 is an apocalyptic number.

It is an amenable number.

261335073 is a deficient number, since it is larger than the sum of its proper divisors (87111695).

261335073 is an equidigital number, since it uses as much as digits as its factorization.

261335073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87111694.

The product of its (nonzero) digits is 11340, while the sum is 30.

The square root of 261335073 is about 16165.8613442031. The cubic root of 261335073 is about 639.3410152223.

The spelling of 261335073 in words is "two hundred sixty-one million, three hundred thirty-five thousand, seventy-three".