641340381 has 8 divisors (see below), whose sum is σ = 932858784. Its totient is φ = 388691120.

The previous prime is 641340367. The next prime is 641340433. The reversal of 641340381 is 183043146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641340381 - 2¹⁵ = 641307613 is a prime.

It is a super-2 number, since 2×641340381² = 822634968602450322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641340311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9717246 + ... + 9717311.

It is an arithmetic number, because the mean of its divisors is an integer number (116607348).

Almost surely, 2^641340381 is an apocalyptic number.

It is an amenable number.

641340381 is a deficient number, since it is larger than the sum of its proper divisors (291518403).

641340381 is a wasteful number, since it uses less digits than its factorization.

641340381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19434571.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 641340381 is about 25324.6990307881. The cubic root of 641340381 is about 862.3750738618.

The spelling of 641340381 in words is "six hundred forty-one million, three hundred forty thousand, three hundred eighty-one".