231336081 has 10 divisors (see below), whose sum is σ = 345576242. Its totient is φ = 154224000.

The previous prime is 231336071. The next prime is 231336097. The reversal of 231336081 is 180633132.

It is a happy number.

231336081 is a `hidden beast` number, since 23 + 1 + 33 + 608 + 1 = 666.

231336081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 162180225 + 69155856 = 12735^2 + 8316^2 .

It is not a de Polignac number, because 231336081 - 2¹⁰ = 231335057 is a prime.

It is a super-2 number, since 2×231336081² = 107032764744877122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231336031) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1427920 + ... + 1428081.

Almost surely, 2^231336081 is an apocalyptic number.

It is an amenable number.

231336081 is a deficient number, since it is larger than the sum of its proper divisors (114240161).

231336081 is an equidigital number, since it uses as much as digits as its factorization.

231336081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856013 (or 2856004 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 231336081 is about 15209.7363882482. The cubic root of 231336081 is about 613.8766644580.

It can be divided in two parts, 2313360 and 81, that added together give a 4-th power (2313441 = 39⁴).

The spelling of 231336081 in words is "two hundred thirty-one million, three hundred thirty-six thousand, eighty-one".