155005331 has 16 divisors (see below), whose sum is σ = 172593120. Its totient is φ = 138309120.

The previous prime is 155005309. The next prime is 155005343. The reversal of 155005331 is 133500551.

155005331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 155005331 - 2⁶ = 155005267 is a prime.

It is a super-2 number, since 2×155005331² = 48053305276839122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155005297 and 155005306.

It is not an unprimeable number, because it can be changed into a prime (155005351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45131 + ... + 48443.

It is an arithmetic number, because the mean of its divisors is an integer number (10787070).

Almost surely, 2^155005331 is an apocalyptic number.

155005331 is a deficient number, since it is larger than the sum of its proper divisors (17587789).

155005331 is a wasteful number, since it uses less digits than its factorization.

155005331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3446.

The product of its (nonzero) digits is 1125, while the sum is 23.

The square root of 155005331 is about 12450.1136942600. The cubic root of 155005331 is about 537.1746938012.

Adding to 155005331 its reverse (133500551), we get a palindrome (288505882).

The spelling of 155005331 in words is "one hundred fifty-five million, five thousand, three hundred thirty-one".