122440561 has 4 divisors (see below), whose sum is σ = 122928624. Its totient is φ = 121952500.

The previous prime is 122440531. The next prime is 122440567. The reversal of 122440561 is 165044221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165044221 = 463 ⋅356467.

It is a cyclic number.

It is not a de Polignac number, because 122440561 - 2¹³ = 122432369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122440567) 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, 243655 + ... + 244156.

It is an arithmetic number, because the mean of its divisors is an integer number (30732156).

Almost surely, 2^122440561 is an apocalyptic number.

It is an amenable number.

122440561 is a deficient number, since it is larger than the sum of its proper divisors (488063).

122440561 is an equidigital number, since it uses as much as digits as its factorization.

122440561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488062.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 122440561 is about 11065.2863044749. The cubic root of 122440561 is about 496.5638545704.

Adding to 122440561 its reverse (165044221), we get a palindrome (287484782).

The spelling of 122440561 in words is "one hundred twenty-two million, four hundred forty thousand, five hundred sixty-one".