100090981 has 8 divisors (see below), whose sum is σ = 101104640. Its totient is φ = 99081792.

The previous prime is 100090979. The next prime is 100090997. The reversal of 100090981 is 189090001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100090981 - 2¹ = 100090979 is a prime.

It is a super-2 number, since 2×100090981² = 20036408955084722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100090961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59356 + ... + 61018.

It is an arithmetic number, because the mean of its divisors is an integer number (12638080).

Almost surely, 2^100090981 is an apocalyptic number.

It is an amenable number.

100090981 is a deficient number, since it is larger than the sum of its proper divisors (1013659).

100090981 is a wasteful number, since it uses less digits than its factorization.

100090981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 100090981 is about 10004.5480157776. The cubic root of 100090981 is about 464.2996061575.

The spelling of 100090981 in words is "one hundred million, ninety thousand, nine hundred eighty-one".