127643431 has 2 divisors, whose sum is σ = 127643432. Its totient is φ = 127643430.

The previous prime is 127643423. The next prime is 127643449. The reversal of 127643431 is 134346721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 127643431 - 2³ = 127643423 is a prime.

It is a super-2 number, since 2×127643431² = 32585690954903522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 127643393 and 127643402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127643401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63821715 + 63821716.

It is an arithmetic number, because the mean of its divisors is an integer number (63821716).

Almost surely, 2^127643431 is an apocalyptic number.

127643431 is a deficient number, since it is larger than the sum of its proper divisors (1).

127643431 is an equidigital number, since it uses as much as digits as its factorization.

127643431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 31.

The square root of 127643431 is about 11297.9392368697. The cubic root of 127643431 is about 503.5000172575.

The spelling of 127643431 in words is "one hundred twenty-seven million, six hundred forty-three thousand, four hundred thirty-one".