105231555 has 160 divisors (see below), whose sum is σ = 234178560. Its totient is φ = 44478720.

The previous prime is 105231551. The next prime is 105231559. The reversal of 105231555 is 555132501.

105231555 is a `hidden beast` number, since 105 + 2 + 3 + 1 + 555 = 666.

It is an interprime number because it is at equal distance from previous prime (105231551) and next prime (105231559).

It is not a de Polignac number, because 105231555 - 2² = 105231551 is a prime.

It is a super-2 number, since 2×105231555² = 22147360335436050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105231551) 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 159 ways as a sum of consecutive naturals, for example, 1332006 + ... + 1332084.

It is an arithmetic number, because the mean of its divisors is an integer number (1463616).

Almost surely, 2^105231555 is an apocalyptic number.

105231555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

105231555 is an abundant number, since it is smaller than the sum of its proper divisors (128947005).

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

105231555 is a wasteful number, since it uses less digits than its factorization.

105231555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 105231555 is about 10258.2432706580. The cubic root of 105231555 is about 472.1159388538.

The spelling of 105231555 in words is "one hundred five million, two hundred thirty-one thousand, five hundred fifty-five".