101988913 has 4 divisors (see below), whose sum is σ = 109834228. Its totient is φ = 94143600.

The previous prime is 101988881. The next prime is 101988917. The reversal of 101988913 is 319889101.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37540129 + 64448784 = 6127^2 + 8028^2 .

It is a cyclic number.

It is not a de Polignac number, because 101988913 - 2⁵ = 101988881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101988917) 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, 3922638 + ... + 3922663.

It is an arithmetic number, because the mean of its divisors is an integer number (27458557).

Almost surely, 2^101988913 is an apocalyptic number.

101988913 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

101988913 is a deficient number, since it is larger than the sum of its proper divisors (7845315).

101988913 is an equidigital number, since it uses as much as digits as its factorization.

101988913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7845314.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 101988913 is about 10098.9560351553. The cubic root of 101988913 is about 467.2159434285.

The spelling of 101988913 in words is "one hundred one million, nine hundred eighty-eight thousand, nine hundred thirteen".