125991923 has 2 divisors, whose sum is σ = 125991924. Its totient is φ = 125991922.

The previous prime is 125991889. The next prime is 125991961. The reversal of 125991923 is 329199521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125991923 - 2¹⁰ = 125990899 is a prime.

It is a super-2 number, since 2×125991923² = 31747929322475858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125991973) 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, 62995961 + 62995962.

It is an arithmetic number, because the mean of its divisors is an integer number (62995962).

Almost surely, 2^125991923 is an apocalyptic number.

125991923 is a deficient number, since it is larger than the sum of its proper divisors (1).

125991923 is an equidigital number, since it uses as much as digits as its factorization.

125991923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 41.

The square root of 125991923 is about 11224.6123763808. The cubic root of 125991923 is about 501.3190809905.

The spelling of 125991923 in words is "one hundred twenty-five million, nine hundred ninety-one thousand, nine hundred twenty-three".