123892921 has 2 divisors, whose sum is σ = 123892922. Its totient is φ = 123892920.

The previous prime is 123892907. The next prime is 123892943. The reversal of 123892921 is 129298321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109935225 + 13957696 = 10485^2 + 3736^2 .

It is a cyclic number.

It is not a de Polignac number, because 123892921 - 2¹¹ = 123890873 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (123892621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61946460 + 61946461.

It is an arithmetic number, because the mean of its divisors is an integer number (61946461).

Almost surely, 2^123892921 is an apocalyptic number.

It is an amenable number.

123892921 is a deficient number, since it is larger than the sum of its proper divisors (1).

123892921 is an equidigital number, since it uses as much as digits as its factorization.

123892921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 123892921 is about 11130.7196982046. The cubic root of 123892921 is about 498.5195153235.

The spelling of 123892921 in words is "one hundred twenty-three million, eight hundred ninety-two thousand, nine hundred twenty-one".