861608164231 has 2 divisors, whose sum is σ = 861608164232. Its totient is φ = 861608164230.

The previous prime is 861608164169. The next prime is 861608164273. The reversal of 861608164231 is 132461806168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861608164231 - 2⁹ = 861608163719 is a prime.

It is a super-4 number, since 4×861608164231⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861608164031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430804082115 + 430804082116.

It is an arithmetic number, because the mean of its divisors is an integer number (430804082116).

Almost surely, 2^861608164231 is an apocalyptic number.

861608164231 is a deficient number, since it is larger than the sum of its proper divisors (1).

861608164231 is an equidigital number, since it uses as much as digits as its factorization.

861608164231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 861608164231 in words is "eight hundred sixty-one billion, six hundred eight million, one hundred sixty-four thousand, two hundred thirty-one".