123749231 has 2 divisors, whose sum is σ = 123749232. Its totient is φ = 123749230.

The previous prime is 123749203. The next prime is 123749233. The reversal of 123749231 is 132947321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123749231 - 2²² = 119554927 is a prime.

It is a super-2 number, since 2×123749231² = 30627744346182722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 123749233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123749233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61874615 + 61874616.

It is an arithmetic number, because the mean of its divisors is an integer number (61874616).

Almost surely, 2^123749231 is an apocalyptic number.

123749231 is a deficient number, since it is larger than the sum of its proper divisors (1).

123749231 is an equidigital number, since it uses as much as digits as its factorization.

123749231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 123749231 is about 11124.2631666102. The cubic root of 123749231 is about 498.3267144778.

The spelling of 123749231 in words is "one hundred twenty-three million, seven hundred forty-nine thousand, two hundred thirty-one".