155531113 has 8 divisors (see below), whose sum is σ = 164800008. Its totient is φ = 146275584.

The previous prime is 155531111. The next prime is 155531137. The reversal of 155531113 is 311135551.

It is a happy number.

155531113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 30382144 + 125148969 = 5512^2 + 11187^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155531113 - 2¹ = 155531111 is a prime.

It is a super-2 number, since 2×155531113² = 48379854222037538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155531111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30495 + ... + 35227.

It is an arithmetic number, because the mean of its divisors is an integer number (20600001).

Almost surely, 2^155531113 is an apocalyptic number.

It is an amenable number.

155531113 is a deficient number, since it is larger than the sum of its proper divisors (9268895).

155531113 is a wasteful number, since it uses less digits than its factorization.

155531113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6683.

The product of its digits is 1125, while the sum is 25.

The square root of 155531113 is about 12471.2113685881. The cubic root of 155531113 is about 537.7813783998.

Adding to 155531113 its reverse (311135551), we get a palindrome (466666664).

The spelling of 155531113 in words is "one hundred fifty-five million, five hundred thirty-one thousand, one hundred thirteen".