122921761 has 4 divisors (see below), whose sum is σ = 123286852. Its totient is φ = 122556672.

The previous prime is 122921759. The next prime is 122921767. The reversal of 122921761 is 167129221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 167129221 = 7 ⋅23875603.

It can be written as a sum of positive squares in 2 ways, for example, as 51840000 + 71081761 = 7200^2 + 8431^2 .

It is a cyclic number.

It is not a de Polignac number, because 122921761 - 2¹ = 122921759 is a prime.

It is a super-2 number, since 2×122921761² = 30219518654682242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122921767) 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 in 3 ways as a sum of consecutive naturals, for example, 182040 + ... + 182713.

It is an arithmetic number, because the mean of its divisors is an integer number (30821713).

Almost surely, 2^122921761 is an apocalyptic number.

It is an amenable number.

122921761 is a deficient number, since it is larger than the sum of its proper divisors (365091).

122921761 is an equidigital number, since it uses as much as digits as its factorization.

122921761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365090.

The product of its digits is 3024, while the sum is 31.

The square root of 122921761 is about 11087.0086587862. The cubic root of 122921761 is about 497.2135145115.

The spelling of 122921761 in words is "one hundred twenty-two million, nine hundred twenty-one thousand, seven hundred sixty-one".