101231556 has 72 divisors (see below), whose sum is σ = 254185344. Its totient is φ = 31331520.

The previous prime is 101231539. The next prime is 101231567. The reversal of 101231556 is 655132101.

It is a super-2 number, since 2×101231556² = 20495655860362272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 234661 + ... + 235091.

It is an arithmetic number, because the mean of its divisors is an integer number (3530352).

Almost surely, 2^101231556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 101231556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127092672).

101231556 is an abundant number, since it is smaller than the sum of its proper divisors (152953788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101231556 is a wasteful number, since it uses less digits than its factorization.

101231556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 101231556 is about 10061.3893672793. The cubic root of 101231556 is about 466.0565730404.

Adding to 101231556 its reverse (655132101), we get a palindrome (756363657).

The spelling of 101231556 in words is "one hundred one million, two hundred thirty-one thousand, five hundred fifty-six".