663139241 has 4 divisors (see below), whose sum is σ = 669336912. Its totient is φ = 656941572.

The previous prime is 663139237. The next prime is 663139261. The reversal of 663139241 is 142931366.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 142931366 = 2 ⋅71465683.

It is a cyclic number.

It is not a de Polignac number, because 663139241 - 2² = 663139237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663139231) 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, 3098675 + ... + 3098888.

It is an arithmetic number, because the mean of its divisors is an integer number (167334228).

Almost surely, 2^663139241 is an apocalyptic number.

It is an amenable number.

663139241 is a deficient number, since it is larger than the sum of its proper divisors (6197671).

663139241 is a wasteful number, since it uses less digits than its factorization.

663139241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6197670.

The product of its digits is 23328, while the sum is 35.

The square root of 663139241 is about 25751.4900733919. The cubic root of 663139241 is about 872.0369942116.

The spelling of 663139241 in words is "six hundred sixty-three million, one hundred thirty-nine thousand, two hundred forty-one".