121161143 has 4 divisors (see below), whose sum is σ = 123978888. Its totient is φ = 118343400.

The previous prime is 121161137. The next prime is 121161149. The reversal of 121161143 is 341161121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341161121 = 7 ⋅48737303.

It is an interprime number because it is at equal distance from previous prime (121161137) and next prime (121161149).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121161143 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 (121161149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1408808 + ... + 1408893.

It is an arithmetic number, because the mean of its divisors is an integer number (30994722).

Almost surely, 2^121161143 is an apocalyptic number.

121161143 is a deficient number, since it is larger than the sum of its proper divisors (2817745).

121161143 is an equidigital number, since it uses as much as digits as its factorization.

121161143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817744.

The product of its digits is 144, while the sum is 20.

The square root of 121161143 is about 11007.3222447605. The cubic root of 121161143 is about 494.8282136951.

The spelling of 121161143 in words is "one hundred twenty-one million, one hundred sixty-one thousand, one hundred forty-three".