642946127 has 4 divisors (see below), whose sum is σ = 655077240. Its totient is φ = 630815016.

The previous prime is 642946123. The next prime is 642946147. The reversal of 642946127 is 721649246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 721649246 = 2 ⋅360824623.

It is a cyclic number.

It is not a de Polignac number, because 642946127 - 2² = 642946123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642946121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6065477 + ... + 6065582.

It is an arithmetic number, because the mean of its divisors is an integer number (163769310).

Almost surely, 2^642946127 is an apocalyptic number.

642946127 is a deficient number, since it is larger than the sum of its proper divisors (12131113).

642946127 is a wasteful number, since it uses less digits than its factorization.

642946127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12131112.

The product of its digits is 145152, while the sum is 41.

The square root of 642946127 is about 25356.3823720972. The cubic root of 642946127 is about 863.0941934249.

The spelling of 642946127 in words is "six hundred forty-two million, nine hundred forty-six thousand, one hundred twenty-seven".