641667137 has 8 divisors (see below), whose sum is σ = 666325440. Its totient is φ = 617177680.

The previous prime is 641667083. The next prime is 641667149. The reversal of 641667137 is 731766146.

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 641667137 - 2⁸ = 641666881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641667094 and 641667103.

It is not an unprimeable number, because it can be changed into a prime (641664137) 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, 34439 + ... + 49692.

It is an arithmetic number, because the mean of its divisors is an integer number (83290680).

Almost surely, 2^641667137 is an apocalyptic number.

It is an amenable number.

641667137 is a deficient number, since it is larger than the sum of its proper divisors (24658303).

641667137 is a wasteful number, since it uses less digits than its factorization.

641667137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84423.

The product of its digits is 127008, while the sum is 41.

The square root of 641667137 is about 25331.1495396478. The cubic root of 641667137 is about 862.5215059260.

Subtracting 641667137 from its reverse (731766146), we obtain a palindrome (90099009).

The spelling of 641667137 in words is "six hundred forty-one million, six hundred sixty-seven thousand, one hundred thirty-seven".