155231151321 has 4 divisors (see below), whose sum is σ = 206974868432. Its totient is φ = 103487434212.

The previous prime is 155231151319. The next prime is 155231151329. The reversal of 155231151321 is 123151132551.

155231151321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 155231151321 - 2¹ = 155231151319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155231151329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25871858551 + ... + 25871858556.

It is an arithmetic number, because the mean of its divisors is an integer number (51743717108).

Almost surely, 2^155231151321 is an apocalyptic number.

It is an amenable number.

155231151321 is a deficient number, since it is larger than the sum of its proper divisors (51743717111).

155231151321 is an equidigital number, since it uses as much as digits as its factorization.

155231151321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51743717110.

The product of its digits is 4500, while the sum is 30.

Adding to 155231151321 its reverse (123151132551), we get a palindrome (278382283872).

The spelling of 155231151321 in words is "one hundred fifty-five billion, two hundred thirty-one million, one hundred fifty-one thousand, three hundred twenty-one".