127213231 has 4 divisors (see below), whose sum is σ = 128955952. Its totient is φ = 125470512.

The previous prime is 127213213. The next prime is 127213259. The reversal of 127213231 is 132312721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 127213231 - 2⁷ = 127213103 is a prime.

It is a super-2 number, since 2×127213231² = 32366412282918722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127213211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 871251 + ... + 871396.

It is an arithmetic number, because the mean of its divisors is an integer number (32238988).

Almost surely, 2^127213231 is an apocalyptic number.

127213231 is a deficient number, since it is larger than the sum of its proper divisors (1742721).

127213231 is an equidigital number, since it uses as much as digits as its factorization.

127213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742720.

The product of its digits is 504, while the sum is 22.

The square root of 127213231 is about 11278.8842976599. The cubic root of 127213231 is about 502.9337274862.

Adding to 127213231 its reverse (132312721), we get a palindrome (259525952).

The spelling of 127213231 in words is "one hundred twenty-seven million, two hundred thirteen thousand, two hundred thirty-one".