101820145 has 16 divisors (see below), whose sum is σ = 146989440. Its totient is φ = 66144384.

The previous prime is 101820139. The next prime is 101820197. The reversal of 101820145 is 541028101.

It is a cyclic number.

It is not a de Polignac number, because 101820145 - 2¹⁵ = 101787377 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 75892 + ... + 77221.

It is an arithmetic number, because the mean of its divisors is an integer number (9186840).

Almost surely, 2^101820145 is an apocalyptic number.

It is an amenable number.

101820145 is a deficient number, since it is larger than the sum of its proper divisors (45169295).

101820145 is a wasteful number, since it uses less digits than its factorization.

101820145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153144.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 101820145 is about 10090.5968604439. The cubic root of 101820145 is about 466.9580898001.

Adding to 101820145 its reverse (541028101), we get a palindrome (642848246).

The spelling of 101820145 in words is "one hundred one million, eight hundred twenty thousand, one hundred forty-five".