101917990 has 16 divisors (see below), whose sum is σ = 183627648. Its totient is φ = 40728256.

The previous prime is 101917967. The next prime is 101918021. The reversal of 101917990 is 99719101.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7659 + ... + 16201.

It is an arithmetic number, because the mean of its divisors is an integer number (11476728).

Almost surely, 2^101917990 is an apocalyptic number.

101917990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

101917990 is a deficient number, since it is larger than the sum of its proper divisors (81709658).

101917990 is a wasteful number, since it uses less digits than its factorization.

101917990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9743.

The product of its (nonzero) digits is 5103, while the sum is 37.

The square root of 101917990 is about 10095.4440219339. Note that the first 3 decimals coincide. The cubic root of 101917990 is about 467.1076177966.

It can be divided in two parts, 10191 and 7990, that added together give a palindrome (18181).

The spelling of 101917990 in words is "one hundred one million, nine hundred seventeen thousand, nine hundred ninety".