121649181 has 4 divisors (see below), whose sum is σ = 162198912. Its totient is φ = 81099452.

The previous prime is 121649167. The next prime is 121649183. The reversal of 121649181 is 181946121.

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 121649181 - 2⁵ = 121649149 is a prime.

It is a super-2 number, since 2×121649181² = 29597046475941522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121649183) 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 3 ways as a sum of consecutive naturals, for example, 20274861 + ... + 20274866.

It is an arithmetic number, because the mean of its divisors is an integer number (40549728).

Almost surely, 2^121649181 is an apocalyptic number.

It is an amenable number.

121649181 is a deficient number, since it is larger than the sum of its proper divisors (40549731).

121649181 is an equidigital number, since it uses as much as digits as its factorization.

121649181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40549730.

The product of its digits is 3456, while the sum is 33.

The square root of 121649181 is about 11029.4687542057. The cubic root of 121649181 is about 495.4917142244.

The spelling of 121649181 in words is "one hundred twenty-one million, six hundred forty-nine thousand, one hundred eighty-one".