101155399 has 4 divisors (see below), whose sum is σ = 101397240. Its totient is φ = 100913560.

The previous prime is 101155381. The next prime is 101155433. The reversal of 101155399 is 993551101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 101155399 - 2⁵ = 101155367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101155199) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 120292 + ... + 121129.

It is an arithmetic number, because the mean of its divisors is an integer number (25349310).

Almost surely, 2^101155399 is an apocalyptic number.

101155399 is a deficient number, since it is larger than the sum of its proper divisors (241841).

101155399 is an equidigital number, since it uses as much as digits as its factorization.

101155399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241840.

The product of its (nonzero) digits is 6075, while the sum is 34.

The square root of 101155399 is about 10057.6040387361. The cubic root of 101155399 is about 465.9396714991.

The spelling of 101155399 in words is "one hundred one million, one hundred fifty-five thousand, three hundred ninety-nine".