121577243 has 4 divisors (see below), whose sum is σ = 121600608. Its totient is φ = 121553880.

The previous prime is 121577231. The next prime is 121577249. The reversal of 121577243 is 342775121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342775121 = 13 ⋅26367317.

It is a cyclic number.

It is not a de Polignac number, because 121577243 - 2²² = 117382939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121577249) 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, 53 + ... + 15593.

It is an arithmetic number, because the mean of its divisors is an integer number (30400152).

Almost surely, 2^121577243 is an apocalyptic number.

121577243 is a deficient number, since it is larger than the sum of its proper divisors (23365).

121577243 is an equidigital number, since it uses as much as digits as its factorization.

121577243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23364.

The product of its digits is 11760, while the sum is 32.

The square root of 121577243 is about 11026.2070994517. The cubic root of 121577243 is about 495.3940242628.

The spelling of 121577243 in words is "one hundred twenty-one million, five hundred seventy-seven thousand, two hundred forty-three".