127252991 has 2 divisors, whose sum is σ = 127252992. Its totient is φ = 127252990.

The previous prime is 127252987. The next prime is 127253059. The reversal of 127252991 is 199252721.

It is a weak prime.

It is an emirp because it is prime and its reverse (199252721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127252991 - 2² = 127252987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127252901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63626495 + 63626496.

It is an arithmetic number, because the mean of its divisors is an integer number (63626496).

Almost surely, 2^127252991 is an apocalyptic number.

127252991 is a deficient number, since it is larger than the sum of its proper divisors (1).

127252991 is an equidigital number, since it uses as much as digits as its factorization.

127252991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 38.

The square root of 127252991 is about 11280.6467456436. The cubic root of 127252991 is about 502.9861186878.

The spelling of 127252991 in words is "one hundred twenty-seven million, two hundred fifty-two thousand, nine hundred ninety-one".