155316231 has 64 divisors (see below), whose sum is σ = 277504000. Its totient is φ = 85730400.

The previous prime is 155316221. The next prime is 155316253. The reversal of 155316231 is 132613551.

155316231 is a `hidden beast` number, since 1 + 5 + 5 + 31 + 623 + 1 = 666.

It is not a de Polignac number, because 155316231 - 2⁶ = 155316167 is a prime.

It is a super-2 number, since 2×155316231² = 48246263224090722, 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 a junction number, because it is equal to n+sod(n) for n = 155316195 and 155316204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155316211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 286821 + ... + 287361.

It is an arithmetic number, because the mean of its divisors is an integer number (4336000).

Almost surely, 2^155316231 is an apocalyptic number.

155316231 is a deficient number, since it is larger than the sum of its proper divisors (122187769).

155316231 is an equidigital number, since it uses as much as digits as its factorization.

155316231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602 (or 582 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 155316231 is about 12462.5932694604. The cubic root of 155316231 is about 537.5335977556.

Adding to 155316231 its reverse (132613551), we get a palindrome (287929782).

The spelling of 155316231 in words is "one hundred fifty-five million, three hundred sixteen thousand, two hundred thirty-one".