493951639 has 2 divisors, whose sum is σ = 493951640. Its totient is φ = 493951638.

The previous prime is 493951637. The next prime is 493951681. The reversal of 493951639 is 936159394.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 493951639 - 2¹ = 493951637 is a prime.

Together with 493951637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 493951592 and 493951601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (493951637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246975819 + 246975820.

It is an arithmetic number, because the mean of its divisors is an integer number (246975820).

Almost surely, 2^493951639 is an apocalyptic number.

493951639 is a deficient number, since it is larger than the sum of its proper divisors (1).

493951639 is an equidigital number, since it uses as much as digits as its factorization.

493951639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 787320, while the sum is 49.

The square root of 493951639 is about 22225.0228121368. The cubic root of 493951639 is about 790.4871422664.

The spelling of 493951639 in words is "four hundred ninety-three million, nine hundred fifty-one thousand, six hundred thirty-nine".