121579143 has 24 divisors (see below), whose sum is σ = 189979632. Its totient is φ = 68955264.

The previous prime is 121579109. The next prime is 121579163. The reversal of 121579143 is 341975121.

It is not a de Polignac number, because 121579143 - 2⁶ = 121579079 is a prime.

It is a super-2 number, since 2×121579143² = 29562976025228898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121579163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17121 + ... + 23157.

It is an arithmetic number, because the mean of its divisors is an integer number (7915818).

Almost surely, 2^121579143 is an apocalyptic number.

121579143 is a deficient number, since it is larger than the sum of its proper divisors (68400489).

121579143 is a wasteful number, since it uses less digits than its factorization.

121579143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6191 (or 6184 counting only the distinct ones).

The product of its digits is 7560, while the sum is 33.

The square root of 121579143 is about 11026.2932574823. The cubic root of 121579143 is about 495.3966049095.

The spelling of 121579143 in words is "one hundred twenty-one million, five hundred seventy-nine thousand, one hundred forty-three".