123483721 has 2 divisors, whose sum is σ = 123483722. Its totient is φ = 123483720.

The previous prime is 123483707. The next prime is 123483739. The reversal of 123483721 is 127384321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108576400 + 14907321 = 10420^2 + 3861^2 .

It is an emirp because it is prime and its reverse (127384321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123483721 - 2¹⁵ = 123450953 is a prime.

It is not a weakly prime, because it can be changed into another prime (123483761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61741860 + 61741861.

It is an arithmetic number, because the mean of its divisors is an integer number (61741861).

Almost surely, 2^123483721 is an apocalyptic number.

It is an amenable number.

123483721 is a deficient number, since it is larger than the sum of its proper divisors (1).

123483721 is an equidigital number, since it uses as much as digits as its factorization.

123483721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 123483721 is about 11112.3229344723. The cubic root of 123483721 is about 497.9700645436.

The spelling of 123483721 in words is "one hundred twenty-three million, four hundred eighty-three thousand, seven hundred twenty-one".