123951791 has 2 divisors, whose sum is σ = 123951792. Its totient is φ = 123951790.

The previous prime is 123951767. The next prime is 123951797. The reversal of 123951791 is 197159321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123951791 - 2²² = 119757487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123951797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61975895 + 61975896.

It is an arithmetic number, because the mean of its divisors is an integer number (61975896).

Almost surely, 2^123951791 is an apocalyptic number.

123951791 is a deficient number, since it is larger than the sum of its proper divisors (1).

123951791 is an equidigital number, since it uses as much as digits as its factorization.

123951791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 38.

The square root of 123951791 is about 11133.3638672236. The cubic root of 123951791 is about 498.5984630591.

The spelling of 123951791 in words is "one hundred twenty-three million, nine hundred fifty-one thousand, seven hundred ninety-one".