127131997 has 2 divisors, whose sum is σ = 127131998. Its totient is φ = 127131996.

The previous prime is 127131959. The next prime is 127132003. The reversal of 127131997 is 799131721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123187801 + 3944196 = 11099^2 + 1986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127131997 is a prime.

It is a super-2 number, since 2×127131997² = 32325089322416018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127131937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63565998 + 63565999.

It is an arithmetic number, because the mean of its divisors is an integer number (63565999).

Almost surely, 2^127131997 is an apocalyptic number.

It is an amenable number.

127131997 is a deficient number, since it is larger than the sum of its proper divisors (1).

127131997 is an equidigital number, since it uses as much as digits as its factorization.

127131997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 40.

The square root of 127131997 is about 11275.2825685213. The cubic root of 127131997 is about 502.8266526234.

The spelling of 127131997 in words is "one hundred twenty-seven million, one hundred thirty-one thousand, nine hundred ninety-seven".