493721687 has 2 divisors, whose sum is σ = 493721688. Its totient is φ = 493721686.

The previous prime is 493721681. The next prime is 493721689. The reversal of 493721687 is 786127394.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 493721687 - 2⁴ = 493721671 is a prime.

It is a super-2 number, since 2×493721687² = 487522208428251938, which contains 22 as substring.

Together with 493721689, 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 (493721681) 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 as a sum of consecutive naturals, namely, 246860843 + 246860844.

It is an arithmetic number, because the mean of its divisors is an integer number (246860844).

Almost surely, 2^493721687 is an apocalyptic number.

493721687 is a deficient number, since it is larger than the sum of its proper divisors (1).

493721687 is an equidigital number, since it uses as much as digits as its factorization.

493721687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 493721687 is about 22219.8489418808. The cubic root of 493721687 is about 790.3644566297.

The spelling of 493721687 in words is "four hundred ninety-three million, seven hundred twenty-one thousand, six hundred eighty-seven".