121862891 has 8 divisors (see below), whose sum is σ = 126280704. Its totient is φ = 117475560.

The previous prime is 121862879. The next prime is 121862899. The reversal of 121862891 is 198268121.

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 121862891 - 2¹⁴ = 121846507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121862899) 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 7 ways as a sum of consecutive naturals, for example, 680 + ... + 15626.

It is an arithmetic number, because the mean of its divisors is an integer number (15785088).

Almost surely, 2^121862891 is an apocalyptic number.

121862891 is a deficient number, since it is larger than the sum of its proper divisors (4417813).

121862891 is a wasteful number, since it uses less digits than its factorization.

121862891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15241.

The product of its digits is 13824, while the sum is 38.

The square root of 121862891 is about 11039.1526395824. The cubic root of 121862891 is about 495.7816999706.

The spelling of 121862891 in words is "one hundred twenty-one million, eight hundred sixty-two thousand, eight hundred ninety-one".