100891249 has 4 divisors (see below), whose sum is σ = 100970100. Its totient is φ = 100812400.

The previous prime is 100891247. The next prime is 100891331. The reversal of 100891249 is 942198001.

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 4223025 + 96668224 = 2055^2 + 9832^2 .

It is a cyclic number.

It is not a de Polignac number, because 100891249 - 2¹ = 100891247 is a prime.

It is a super-3 number, since 3×100891249³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100891247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37474 + ... + 40075.

It is an arithmetic number, because the mean of its divisors is an integer number (25242525).

Almost surely, 2^100891249 is an apocalyptic number.

It is an amenable number.

100891249 is a deficient number, since it is larger than the sum of its proper divisors (78851).

100891249 is an equidigital number, since it uses as much as digits as its factorization.

100891249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78850.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 100891249 is about 10044.4635994163. The cubic root of 100891249 is about 465.5337440730.

The spelling of 100891249 in words is "one hundred million, eight hundred ninety-one thousand, two hundred forty-nine".