641616937 has 4 divisors (see below), whose sum is σ = 690972100. Its totient is φ = 592261776.

The previous prime is 641616883. The next prime is 641616953. The reversal of 641616937 is 739616146.

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

It can be written as a sum of positive squares in 2 ways, for example, as 73462041 + 568154896 = 8571^2 + 23836^2 .

It is a cyclic number.

It is not a de Polignac number, because 641616937 - 2²⁷ = 507399209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 641616893 and 641616902.

It is not an unprimeable number, because it can be changed into a prime (641616977) 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, 24677562 + ... + 24677587.

It is an arithmetic number, because the mean of its divisors is an integer number (172743025).

Almost surely, 2^641616937 is an apocalyptic number.

It is an amenable number.

641616937 is a deficient number, since it is larger than the sum of its proper divisors (49355163).

641616937 is a wasteful number, since it uses less digits than its factorization.

641616937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49355162.

The product of its digits is 163296, while the sum is 43.

The square root of 641616937 is about 25330.1586453776. The cubic root of 641616937 is about 862.4990125873.

The spelling of 641616937 in words is "six hundred forty-one million, six hundred sixteen thousand, nine hundred thirty-seven".