100190981 has 8 divisors (see below), whose sum is σ = 111625344. Its totient is φ = 89144320.

The previous prime is 100190957. The next prime is 100190983. The reversal of 100190981 is 189091001.

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 100190981 - 2¹⁸ = 99928837 is a prime.

It is a super-2 number, since 2×100190981² = 20076465347484722, 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 (100190983) 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, 96380 + ... + 97413.

It is an arithmetic number, because the mean of its divisors is an integer number (13953168).

Almost surely, 2^100190981 is an apocalyptic number.

100190981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100190981 is a deficient number, since it is larger than the sum of its proper divisors (11434363).

100190981 is a wasteful number, since it uses less digits than its factorization.

100190981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193851.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 100190981 is about 10009.5444951306. The cubic root of 100190981 is about 464.4541805462.

The spelling of 100190981 in words is "one hundred million, one hundred ninety thousand, nine hundred eighty-one".