121945291 has 8 divisors (see below), whose sum is σ = 134380400. Its totient is φ = 109946592.

The previous prime is 121945253. The next prime is 121945297. The reversal of 121945291 is 192549121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121945291 - 2⁷ = 121945163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121945297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108516 + ... + 109633.

It is an arithmetic number, because the mean of its divisors is an integer number (16797550).

Almost surely, 2^121945291 is an apocalyptic number.

121945291 is a deficient number, since it is larger than the sum of its proper divisors (12435109).

121945291 is a wasteful number, since it uses less digits than its factorization.

121945291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218205.

The product of its digits is 6480, while the sum is 34.

The square root of 121945291 is about 11042.8841794162. The cubic root of 121945291 is about 495.8934189894.

The spelling of 121945291 in words is "one hundred twenty-one million, nine hundred forty-five thousand, two hundred ninety-one".