641248339 has 4 divisors (see below), whose sum is σ = 641335024. Its totient is φ = 641161656.

The previous prime is 641248327. The next prime is 641248343. The reversal of 641248339 is 933842146.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641248339 - 2²¹ = 639151187 is a prime.

It is a super-2 number, since 2×641248339² = 822398864540517842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641248039) 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, 31092 + ... + 47425.

It is an arithmetic number, because the mean of its divisors is an integer number (160333756).

Almost surely, 2^641248339 is an apocalyptic number.

641248339 is a deficient number, since it is larger than the sum of its proper divisors (86685).

641248339 is an equidigital number, since it uses as much as digits as its factorization.

641248339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86684.

The product of its digits is 124416, while the sum is 40.

The square root of 641248339 is about 25322.8817277971. The cubic root of 641248339 is about 862.3338172861. Note that the first 3 decimals are identical.

The spelling of 641248339 in words is "six hundred forty-one million, two hundred forty-eight thousand, three hundred thirty-nine".