122278749 has 4 divisors (see below), whose sum is σ = 163038336. Its totient is φ = 81519164.

The previous prime is 122278721. The next prime is 122278753. The reversal of 122278749 is 947872221.

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.

It is a cyclic number.

It is not a de Polignac number, because 122278749 - 2⁸ = 122278493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122278749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122278789) 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, 20379789 + ... + 20379794.

It is an arithmetic number, because the mean of its divisors is an integer number (40759584).

Almost surely, 2^122278749 is an apocalyptic number.

It is an amenable number.

122278749 is a deficient number, since it is larger than the sum of its proper divisors (40759587).

122278749 is an equidigital number, since it uses as much as digits as its factorization.

122278749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40759586.

The product of its digits is 112896, while the sum is 42.

The square root of 122278749 is about 11057.9721920432. The cubic root of 122278749 is about 496.3450125694.

The spelling of 122278749 in words is "one hundred twenty-two million, two hundred seventy-eight thousand, seven hundred forty-nine".