126120991 has 2 divisors, whose sum is σ = 126120992. Its totient is φ = 126120990.

The previous prime is 126120959. The next prime is 126121003. The reversal of 126120991 is 199021621.

It is a strong prime.

It is an emirp because it is prime and its reverse (199021621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126120991 - 2⁵ = 126120959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126120941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63060495 + 63060496.

It is an arithmetic number, because the mean of its divisors is an integer number (63060496).

Almost surely, 2^126120991 is an apocalyptic number.

126120991 is a deficient number, since it is larger than the sum of its proper divisors (1).

126120991 is an equidigital number, since it uses as much as digits as its factorization.

126120991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 126120991 is about 11230.3602346496. The cubic root of 126120991 is about 501.4902088096.

The spelling of 126120991 in words is "one hundred twenty-six million, one hundred twenty thousand, nine hundred ninety-one".