127321981 has 2 divisors, whose sum is σ = 127321982. Its totient is φ = 127321980.

The previous prime is 127321979. The next prime is 127322003. The reversal of 127321981 is 189123721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85266756 + 42055225 = 9234^2 + 6485^2 .

It is a cyclic number.

It is not a de Polignac number, because 127321981 - 2¹ = 127321979 is a prime.

It is a super-2 number, since 2×127321981² = 32421773691528722, which contains 22 as substring.

Together with 127321979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127301981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63660990 + 63660991.

It is an arithmetic number, because the mean of its divisors is an integer number (63660991).

Almost surely, 2^127321981 is an apocalyptic number.

It is an amenable number.

127321981 is a deficient number, since it is larger than the sum of its proper divisors (1).

127321981 is an equidigital number, since it uses as much as digits as its factorization.

127321981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 127321981 is about 11283.7042233479. The cubic root of 127321981 is about 503.0769999653.

The spelling of 127321981 in words is "one hundred twenty-seven million, three hundred twenty-one thousand, nine hundred eighty-one".