155232231 has 24 divisors (see below), whose sum is σ = 260007552. Its totient is φ = 80638800.

The previous prime is 155232179. The next prime is 155232247. The reversal of 155232231 is 132232551.

It is a happy number.

155232231 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 155232231 - 2⁶ = 155232167 is a prime.

It is a super-2 number, since 2×155232231² = 48194091082474722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155233231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28005 + ... + 33086.

It is an arithmetic number, because the mean of its divisors is an integer number (10833648).

Almost surely, 2^155232231 is an apocalyptic number.

155232231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155232231 is a deficient number, since it is larger than the sum of its proper divisors (104775321).

155232231 is a wasteful number, since it uses less digits than its factorization.

155232231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61123 (or 61112 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 155232231 is about 12459.2227285654. Note that the first 3 decimals coincide. The cubic root of 155232231 is about 537.4366751430.

Adding to 155232231 its reverse (132232551), we get a palindrome (287464782).

The spelling of 155232231 in words is "one hundred fifty-five million, two hundred thirty-two thousand, two hundred thirty-one".