101115531 has 12 divisors (see below), whose sum is σ = 159333720. Its totient is φ = 61282080.

The previous prime is 101115527. The next prime is 101115551. The reversal of 101115531 is 135511101.

101115531 is a `hidden beast` number, since 1 + 0 + 111 + 553 + 1 = 666.

It is not a de Polignac number, because 101115531 - 2² = 101115527 is a prime.

It is a super-2 number, since 2×101115531² = 20448701218823922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (101115551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 510586 + ... + 510783.

It is an arithmetic number, because the mean of its divisors is an integer number (13277810).

Almost surely, 2^101115531 is an apocalyptic number.

101115531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

101115531 is a deficient number, since it is larger than the sum of its proper divisors (58218189).

101115531 is a wasteful number, since it uses less digits than its factorization.

101115531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021386 (or 1021383 counting only the distinct ones).

The product of its (nonzero) digits is 75, while the sum is 18.

The square root of 101115531 is about 10055.6218604321. The cubic root of 101115531 is about 465.8784504340.

Adding to 101115531 its reverse (135511101), we get a palindrome (236626632).

The spelling of 101115531 in words is "one hundred one million, one hundred fifteen thousand, five hundred thirty-one".