494135139021 has 4 divisors (see below), whose sum is σ = 658846852032. Its totient is φ = 329423426012.

The previous prime is 494135139013. The next prime is 494135139073. The reversal of 494135139021 is 120931531494.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 494135139021 - 2³ = 494135139013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (494135132021) 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, 82355856501 + ... + 82355856506.

It is an arithmetic number, because the mean of its divisors is an integer number (164711713008).

Almost surely, 2^494135139021 is an apocalyptic number.

It is an amenable number.

494135139021 is a deficient number, since it is larger than the sum of its proper divisors (164711713011).

494135139021 is a wasteful number, since it uses less digits than its factorization.

494135139021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164711713010.

The product of its (nonzero) digits is 116640, while the sum is 42.

The spelling of 494135139021 in words is "four hundred ninety-four billion, one hundred thirty-five million, one hundred thirty-nine thousand, twenty-one".