641399 has 4 divisors (see below), whose sum is σ = 699720. Its totient is φ = 583080.

The previous prime is 641387. The next prime is 641411. The reversal of 641399 is 993146.

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

It is an interprime number because it is at equal distance from previous prime (641387) and next prime (641411).

It is a cyclic number.

It is not a de Polignac number, because 641399 - 2⁸ = 641143 is a prime.

It is a super-2 number, since 2×641399² = 822785354402, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641299) 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, 29144 + ... + 29165.

It is an arithmetic number, because the mean of its divisors is an integer number (174930).

2⁶⁴¹³⁹⁹ is an apocalyptic number.

641399 is a deficient number, since it is larger than the sum of its proper divisors (58321).

641399 is a wasteful number, since it uses less digits than its factorization.

641399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58320.

The product of its digits is 5832, while the sum is 32.

The square root of 641399 is about 800.8738976893. The cubic root of 641399 is about 86.2401346975.

The spelling of 641399 in words is "six hundred forty-one thousand, three hundred ninety-nine".