155521113 has 32 divisors (see below), whose sum is σ = 236476800. Its totient is φ = 90048000.

The previous prime is 155521063. The next prime is 155521129. The reversal of 155521113 is 311125551.

It is not a de Polignac number, because 155521113 - 2²⁰ = 154472537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155521013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95853 + ... + 97461.

It is an arithmetic number, because the mean of its divisors is an integer number (7389900).

Almost surely, 2^155521113 is an apocalyptic number.

It is an amenable number.

155521113 is a deficient number, since it is larger than the sum of its proper divisors (80955687).

155521113 is a wasteful number, since it uses less digits than its factorization.

155521113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753.

The product of its digits is 750, while the sum is 24.

The square root of 155521113 is about 12470.8104387806. The cubic root of 155521113 is about 537.7698524551.

Adding to 155521113 its reverse (311125551), we get a palindrome (466646664).

The spelling of 155521113 in words is "one hundred fifty-five million, five hundred twenty-one thousand, one hundred thirteen".