642946487 has 2 divisors, whose sum is σ = 642946488. Its totient is φ = 642946486.

The previous prime is 642946459. The next prime is 642946489. The reversal of 642946487 is 784649246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642946487 - 2¹⁰ = 642945463 is a prime.

Together with 642946489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642946489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321473243 + 321473244.

It is an arithmetic number, because the mean of its divisors is an integer number (321473244).

Almost surely, 2^642946487 is an apocalyptic number.

642946487 is a deficient number, since it is larger than the sum of its proper divisors (1).

642946487 is an equidigital number, since it uses as much as digits as its factorization.

642946487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 50.

The square root of 642946487 is about 25356.3894709006. The cubic root of 642946487 is about 863.0943545134.

The spelling of 642946487 in words is "six hundred forty-two million, nine hundred forty-six thousand, four hundred eighty-seven".