122737721 has 2 divisors, whose sum is σ = 122737722. Its totient is φ = 122737720.

The previous prime is 122737691. The next prime is 122737751. The reversal of 122737721 is 127737221.

It is a balanced prime because it is at equal distance from previous prime (122737691) and next prime (122737751).

It can be written as a sum of positive squares in only one way, i.e., 121440400 + 1297321 = 11020^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 122737721 - 2²² = 118543417 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (122737751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61368860 + 61368861.

It is an arithmetic number, because the mean of its divisors is an integer number (61368861).

Almost surely, 2^122737721 is an apocalyptic number.

It is an amenable number.

122737721 is a deficient number, since it is larger than the sum of its proper divisors (1).

122737721 is an equidigital number, since it uses as much as digits as its factorization.

122737721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8232, while the sum is 32.

The square root of 122737721 is about 11078.7057457087. The cubic root of 122737721 is about 496.9652457996.

The spelling of 122737721 in words is "one hundred twenty-two million, seven hundred thirty-seven thousand, seven hundred twenty-one".