122779081 has 4 divisors (see below), whose sum is σ = 123059200. Its totient is φ = 122498964.

The previous prime is 122779067. The next prime is 122779091. The reversal of 122779081 is 180977221.

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: 180977221 = 1279 ⋅141499.

It is a cyclic number.

It is not a de Polignac number, because 122779081 - 2¹¹ = 122777033 is a prime.

It is a super-2 number, since 2×122779081² = 30149405462409122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122779081.

It is not an unprimeable number, because it can be changed into a prime (122779091) 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, 139401 + ... + 140278.

It is an arithmetic number, because the mean of its divisors is an integer number (30764800).

Almost surely, 2^122779081 is an apocalyptic number.

It is an amenable number.

122779081 is a deficient number, since it is larger than the sum of its proper divisors (280119).

122779081 is an equidigital number, since it uses as much as digits as its factorization.

122779081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280118.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 122779081 is about 11080.5722325158. The cubic root of 122779081 is about 497.0210617678.

It can be divided in two parts, 1227 and 79081, that added together give a palindrome (80308).

The spelling of 122779081 in words is "one hundred twenty-two million, seven hundred seventy-nine thousand, eighty-one".