121003649 has 4 divisors (see below), whose sum is σ = 130311636. Its totient is φ = 111695664.

The previous prime is 121003643. The next prime is 121003651. The reversal of 121003649 is 946300121.

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 10080625 + 110923024 = 3175^2 + 10532^2 .

It is a cyclic number.

It is not a de Polignac number, because 121003649 - 2¹² = 120999553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121003643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4653974 + ... + 4653999.

It is an arithmetic number, because the mean of its divisors is an integer number (32577909).

Almost surely, 2^121003649 is an apocalyptic number.

It is an amenable number.

121003649 is a deficient number, since it is larger than the sum of its proper divisors (9307987).

121003649 is an equidigital number, since it uses as much as digits as its factorization.

121003649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9307986.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 121003649 is about 11000.1658623859. The cubic root of 121003649 is about 494.6137162509.

The spelling of 121003649 in words is "one hundred twenty-one million, three thousand, six hundred forty-nine".