101550581 has 6 divisors (see below), whose sum is σ = 111621846. Its totient is φ = 92318600.

The previous prime is 101550557. The next prime is 101550587. The reversal of 101550581 is 185055101.

It can be written as a sum of positive squares in only one way, i.e., 91374481 + 10176100 = 9559^2 + 3190^2 .

It is not a de Polignac number, because 101550581 - 2¹⁰ = 101549557 is a prime.

It is a super-2 number, since 2×101550581² = 20625041002875122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101550581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101550587) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 419510 + ... + 419751.

It is an arithmetic number, because the mean of its divisors is an integer number (18603641).

Almost surely, 2^101550581 is an apocalyptic number.

101550581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

101550581 is a deficient number, since it is larger than the sum of its proper divisors (10071265).

101550581 is an equidigital number, since it uses as much as digits as its factorization.

101550581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839283 (or 839272 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 26.

The square root of 101550581 is about 10077.2308200219. The cubic root of 101550581 is about 466.5456424828.

The spelling of 101550581 in words is "one hundred one million, five hundred fifty thousand, five hundred eighty-one".