231155432155251 has 6 divisors (see below), whose sum is σ = 333891179779820. Its totient is φ = 154103621436828.

The previous prime is 231155432155243. The next prime is 231155432155283. The reversal of 231155432155251 is 152551234551132.

231155432155251 is a `hidden beast` number, since 2 + 3 + 1 + 1 + 5 + 5 + 43 + 2 + 1 + 552 + 51 = 666.

231155432155251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231155432155251 - 2³ = 231155432155243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231155432155197 and 231155432155206.

It is not an unprimeable number, because it can be changed into a prime (231155432155231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12841968453061 + ... + 12841968453078.

Almost surely, 2^{231155432155251} is an apocalyptic number.

231155432155251 is a deficient number, since it is larger than the sum of its proper divisors (102735747624569).

231155432155251 is a wasteful number, since it uses less digits than its factorization.

231155432155251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25683936906145 (or 25683936906142 counting only the distinct ones).

The product of its digits is 900000, while the sum is 45.

The spelling of 231155432155251 in words is "two hundred thirty-one trillion, one hundred fifty-five billion, four hundred thirty-two million, one hundred fifty-five thousand, two hundred fifty-one".