641737697 has 4 divisors (see below), whose sum is σ = 669639360. Its totient is φ = 613836036.

The previous prime is 641737693. The next prime is 641737703. The reversal of 641737697 is 796737146.

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.

It is a cyclic number.

It is not a de Polignac number, because 641737697 - 2² = 641737693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641737693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13950797 + ... + 13950842.

It is an arithmetic number, because the mean of its divisors is an integer number (167409840).

Almost surely, 2^641737697 is an apocalyptic number.

It is an amenable number.

641737697 is a deficient number, since it is larger than the sum of its proper divisors (27901663).

641737697 is a wasteful number, since it uses less digits than its factorization.

641737697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27901662.

The product of its digits is 1333584, while the sum is 50.

The square root of 641737697 is about 25332.5422529994. The cubic root of 641737697 is about 862.5531200778.

The spelling of 641737697 in words is "six hundred forty-one million, seven hundred thirty-seven thousand, six hundred ninety-seven".