127211531 has 2 divisors, whose sum is σ = 127211532. Its totient is φ = 127211530.

The previous prime is 127211521. The next prime is 127211533. The reversal of 127211531 is 135112721.

It is a strong prime.

It is an emirp because it is prime and its reverse (135112721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127211531 is a prime.

It is a super-2 number, since 2×127211531² = 32365547238727922, which contains 22 as substring.

Together with 127211533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 127211497 and 127211506.

It is not a weakly prime, because it can be changed into another prime (127211533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63605765 + 63605766.

It is an arithmetic number, because the mean of its divisors is an integer number (63605766).

Almost surely, 2^127211531 is an apocalyptic number.

127211531 is a deficient number, since it is larger than the sum of its proper divisors (1).

127211531 is an equidigital number, since it uses as much as digits as its factorization.

127211531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 23.

The square root of 127211531 is about 11278.8089353442. The cubic root of 127211531 is about 502.9314871764.

The spelling of 127211531 in words is "one hundred twenty-seven million, two hundred eleven thousand, five hundred thirty-one".