121444561 has 16 divisors (see below), whose sum is σ = 146406400. Its totient is φ = 98409168.

The previous prime is 121444553. The next prime is 121444573. The reversal of 121444561 is 165444121.

It is a cyclic number.

It is not a de Polignac number, because 121444561 - 2³ = 121444553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121444511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113716 + ... + 114778.

It is an arithmetic number, because the mean of its divisors is an integer number (9150400).

Almost surely, 2^121444561 is an apocalyptic number.

It is an amenable number.

121444561 is a deficient number, since it is larger than the sum of its proper divisors (24961839).

121444561 is a wasteful number, since it uses less digits than its factorization.

121444561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948.

The product of its digits is 3840, while the sum is 28.

The square root of 121444561 is about 11020.1887914863. The cubic root of 121444561 is about 495.2137443738.

Adding to 121444561 its reverse (165444121), we get a palindrome (286888682).

The spelling of 121444561 in words is "one hundred twenty-one million, four hundred forty-four thousand, five hundred sixty-one".