122151661 has 2 divisors, whose sum is σ = 122151662. Its totient is φ = 122151660.

The previous prime is 122151641. The next prime is 122151709. The reversal of 122151661 is 166151221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82537225 + 39614436 = 9085^2 + 6294^2 .

It is an emirp because it is prime and its reverse (166151221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122151661 - 2²¹ = 120054509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122151611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61075830 + 61075831.

It is an arithmetic number, because the mean of its divisors is an integer number (61075831).

Almost surely, 2^122151661 is an apocalyptic number.

It is an amenable number.

122151661 is a deficient number, since it is larger than the sum of its proper divisors (1).

122151661 is an equidigital number, since it uses as much as digits as its factorization.

122151661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 25.

The square root of 122151661 is about 11052.2242557777. The cubic root of 122151661 is about 496.1729975039.

The spelling of 122151661 in words is "one hundred twenty-two million, one hundred fifty-one thousand, six hundred sixty-one".