261128488431 has 8 divisors (see below), whose sum is σ = 348179318784. Its totient is φ = 174081658520.

The previous prime is 261128488399. The next prime is 261128488433. The reversal of 261128488431 is 134884821162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261128488431 - 2⁵ = 261128488399 is a prime.

It is a super-2 number, since 2×261128488431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261128488433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 844335 + ... + 1111376.

It is an arithmetic number, because the mean of its divisors is an integer number (43522414848).

Almost surely, 2^261128488431 is an apocalyptic number.

261128488431 is a deficient number, since it is larger than the sum of its proper divisors (87050830353).

261128488431 is a wasteful number, since it uses less digits than its factorization.

261128488431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000221.

The product of its digits is 589824, while the sum is 48.

The spelling of 261128488431 in words is "two hundred sixty-one billion, one hundred twenty-eight million, four hundred eighty-eight thousand, four hundred thirty-one".