123740791 has 2 divisors, whose sum is σ = 123740792. Its totient is φ = 123740790.

The previous prime is 123740783. The next prime is 123740861. The reversal of 123740791 is 197047321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123740791 - 2³ = 123740783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123740761) 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 as a sum of consecutive naturals, namely, 61870395 + 61870396.

It is an arithmetic number, because the mean of its divisors is an integer number (61870396).

Almost surely, 2^123740791 is an apocalyptic number.

123740791 is a deficient number, since it is larger than the sum of its proper divisors (1).

123740791 is an equidigital number, since it uses as much as digits as its factorization.

123740791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 123740791 is about 11123.8838091738. The cubic root of 123740791 is about 498.3153851869.

The spelling of 123740791 in words is "one hundred twenty-three million, seven hundred forty thousand, seven hundred ninety-one".