121983157 has 4 divisors (see below), whose sum is σ = 124284780. Its totient is φ = 119681536.

The previous prime is 121983137. The next prime is 121983163. The reversal of 121983157 is 751389121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 58844241 + 63138916 = 7671^2 + 7946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121983157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121983107) 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, 1150732 + ... + 1150837.

It is an arithmetic number, because the mean of its divisors is an integer number (31071195).

Almost surely, 2^121983157 is an apocalyptic number.

It is an amenable number.

121983157 is a deficient number, since it is larger than the sum of its proper divisors (2301623).

121983157 is an equidigital number, since it uses as much as digits as its factorization.

121983157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301622.

The product of its digits is 15120, while the sum is 37.

The square root of 121983157 is about 11044.5985440848. The cubic root of 121983157 is about 495.9447413400.

The spelling of 121983157 in words is "one hundred twenty-one million, nine hundred eighty-three thousand, one hundred fifty-seven".