100121649 has 4 divisors (see below), whose sum is σ = 133495536. Its totient is φ = 66747764.

The previous prime is 100121639. The next prime is 100121669. The reversal of 100121649 is 946121001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100121649 - 2⁷ = 100121521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100121639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16686939 + ... + 16686944.

It is an arithmetic number, because the mean of its divisors is an integer number (33373884).

Almost surely, 2^100121649 is an apocalyptic number.

It is an amenable number.

100121649 is a deficient number, since it is larger than the sum of its proper divisors (33373887).

100121649 is an equidigital number, since it uses as much as digits as its factorization.

100121649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33373886.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 100121649 is about 10006.0806013144. The cubic root of 100121649 is about 464.3470219723.

The spelling of 100121649 in words is "one hundred million, one hundred twenty-one thousand, six hundred forty-nine".