10099981 has 8 divisors (see below), whose sum is σ = 10411128. Its totient is φ = 9792000.

The previous prime is 10099979. The next prime is 10099997. The reversal of 10099981 is 18999001.

It can be written as a sum of positive squares in 4 ways, for example, as 1602756 + 8497225 = 1266^2 + 2915^2 .

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 10099981 - 2¹ = 10099979 is a prime.

It is a super-2 number, since 2×10099981² = 204019232400722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10099981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10099961) 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 7 ways as a sum of consecutive naturals, for example, 6741 + ... + 8101.

It is an arithmetic number, because the mean of its divisors is an integer number (1301391).

Almost surely, 2^10099981 is an apocalyptic number.

It is an amenable number.

10099981 is a deficient number, since it is larger than the sum of its proper divisors (311147).

10099981 is a wasteful number, since it uses less digits than its factorization.

10099981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 10099981 is about 3178.0467271581. The cubic root of 10099981 is about 216.1590977490.

The spelling of 10099981 in words is "ten million, ninety-nine thousand, nine hundred eighty-one".