121772843 has 4 divisors (see below), whose sum is σ = 128181960. Its totient is φ = 115363728.

The previous prime is 121772839. The next prime is 121772863. The reversal of 121772843 is 348277121.

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

It is a cyclic number.

It is not a de Polignac number, because 121772843 - 2² = 121772839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121772863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3204530 + ... + 3204567.

It is an arithmetic number, because the mean of its divisors is an integer number (32045490).

Almost surely, 2^121772843 is an apocalyptic number.

121772843 is a deficient number, since it is larger than the sum of its proper divisors (6409117).

121772843 is an equidigital number, since it uses as much as digits as its factorization.

121772843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6409116.

The product of its digits is 18816, while the sum is 35.

The square root of 121772843 is about 11035.0733119450. The cubic root of 121772843 is about 495.6595540875.

The spelling of 121772843 in words is "one hundred twenty-one million, seven hundred seventy-two thousand, eight hundred forty-three".