261126207319 has 4 divisors (see below), whose sum is σ = 262119082896. Its totient is φ = 260133331744.

The previous prime is 261126207313. The next prime is 261126207341. The reversal of 261126207319 is 913702621162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261126207319 - 2³ = 261126207311 is a prime.

It is a super-2 number, since 2×261126207319² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261126207311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496437394 + ... + 496437919.

It is an arithmetic number, because the mean of its divisors is an integer number (65529770724).

Almost surely, 2^261126207319 is an apocalyptic number.

261126207319 is a deficient number, since it is larger than the sum of its proper divisors (992875577).

261126207319 is an equidigital number, since it uses as much as digits as its factorization.

261126207319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992875576.

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 261126207319 in words is "two hundred sixty-one billion, one hundred twenty-six million, two hundred seven thousand, three hundred nineteen".