155315331 has 12 divisors (see below), whose sum is σ = 224467152. Its totient is φ = 103486896.

The previous prime is 155315287. The next prime is 155315341. The reversal of 155315331 is 133513551.

155315331 is a `hidden beast` number, since 15 + 5 + 315 + 331 = 666.

It is not a de Polignac number, because 155315331 - 2⁷ = 155315203 is a prime.

It is a super-2 number, since 2×155315331² = 48245704087279122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155315295 and 155315304.

It is not an unprimeable number, because it can be changed into a prime (155315341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18810 + ... + 25776.

It is an arithmetic number, because the mean of its divisors is an integer number (18705596).

Almost surely, 2^155315331 is an apocalyptic number.

155315331 is a deficient number, since it is larger than the sum of its proper divisors (69151821).

155315331 is a wasteful number, since it uses less digits than its factorization.

155315331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450 (or 9447 counting only the distinct ones).

The product of its digits is 3375, while the sum is 27.

The square root of 155315331 is about 12462.5571613534. The cubic root of 155315331 is about 537.5325594843.

Adding to 155315331 its reverse (133513551), we get a palindrome (288828882).

The spelling of 155315331 in words is "one hundred fifty-five million, three hundred fifteen thousand, three hundred thirty-one".