261710858231 has 4 divisors (see below), whose sum is σ = 262951194264. Its totient is φ = 260470522200.

The previous prime is 261710858207. The next prime is 261710858261. The reversal of 261710858231 is 132858017162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261710858231 is a prime.

It is a super-2 number, since 2×261710858231² (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 (261710858261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620167700 + ... + 620168121.

It is an arithmetic number, because the mean of its divisors is an integer number (65737798566).

Almost surely, 2^261710858231 is an apocalyptic number.

261710858231 is a deficient number, since it is larger than the sum of its proper divisors (1240336033).

261710858231 is a wasteful number, since it uses less digits than its factorization.

261710858231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240336032.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 261710858231 in words is "two hundred sixty-one billion, seven hundred ten million, eight hundred fifty-eight thousand, two hundred thirty-one".