121649018 has 4 divisors (see below), whose sum is σ = 182473530. Its totient is φ = 60824508.

The previous prime is 121648999. The next prime is 121649029. The reversal of 121649018 is 810946121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 121594729 + 54289 = 11027^2 + 233^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30412253 + ... + 30412256.

Almost surely, 2^121649018 is an apocalyptic number.

121649018 is a deficient number, since it is larger than the sum of its proper divisors (60824512).

121649018 is an equidigital number, since it uses as much as digits as its factorization.

121649018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60824511.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 121649018 is about 11029.4613649081. The cubic root of 121649018 is about 495.4914929182.

The spelling of 121649018 in words is "one hundred twenty-one million, six hundred forty-nine thousand, eighteen".