123933721 has 2 divisors, whose sum is σ = 123933722. Its totient is φ = 123933720.

The previous prime is 123933709. The next prime is 123933737. The reversal of 123933721 is 127339321.

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., 65028096 + 58905625 = 8064^2 + 7675^2 .

It is an emirp because it is prime and its reverse (127339321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123933721 - 2²³ = 115545113 is a prime.

It is not a weakly prime, because it can be changed into another prime (123933781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61966860 + 61966861.

It is an arithmetic number, because the mean of its divisors is an integer number (61966861).

Almost surely, 2^123933721 is an apocalyptic number.

It is an amenable number.

123933721 is a deficient number, since it is larger than the sum of its proper divisors (1).

123933721 is an equidigital number, since it uses as much as digits as its factorization.

123933721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 31.

The square root of 123933721 is about 11132.5523129245. The cubic root of 123933721 is about 498.5742329075.

The spelling of 123933721 in words is "one hundred twenty-three million, nine hundred thirty-three thousand, seven hundred twenty-one".