122748781 has 2 divisors, whose sum is σ = 122748782. Its totient is φ = 122748780.

The previous prime is 122748779. The next prime is 122748799. The reversal of 122748781 is 187847221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117614025 + 5134756 = 10845^2 + 2266^2 .

It is a cyclic number.

It is not a de Polignac number, because 122748781 - 2¹ = 122748779 is a prime.

It is a super-2 number, since 2×122748781² = 30134526473971922, which contains 22 as substring.

Together with 122748779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122748701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61374390 + 61374391.

It is an arithmetic number, because the mean of its divisors is an integer number (61374391).

Almost surely, 2^122748781 is an apocalyptic number.

It is an amenable number.

122748781 is a deficient number, since it is larger than the sum of its proper divisors (1).

122748781 is an equidigital number, since it uses as much as digits as its factorization.

122748781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50176, while the sum is 40.

The square root of 122748781 is about 11079.2048902437. The cubic root of 122748781 is about 496.9801726710.

The spelling of 122748781 in words is "one hundred twenty-two million, seven hundred forty-eight thousand, seven hundred eighty-one".