1641534217 has 8 divisors (see below), whose sum is σ = 1676926152. Its totient is φ = 1606416000.

The previous prime is 1641534199. The next prime is 1641534221. The reversal of 1641534217 is 7124351461.

It can be written as a sum of positive squares in 4 ways, for example, as 151265401 + 1490268816 = 12299^2 + 38604^2 .

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 1641534217 - 2²³ = 1633145609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641534017) 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, 56284 + ... + 80317.

It is an arithmetic number, because the mean of its divisors is an integer number (209615769).

Almost surely, 2^1641534217 is an apocalyptic number.

It is an amenable number.

1641534217 is a deficient number, since it is larger than the sum of its proper divisors (35391935).

1641534217 is a wasteful number, since it uses less digits than its factorization.

1641534217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136859.

The product of its digits is 20160, while the sum is 34.

The square root of 1641534217 is about 40515.8514287927. The cubic root of 1641534217 is about 1179.6413295137.

Adding to 1641534217 its reverse (7124351461), we get a palindrome (8765885678).

The spelling of 1641534217 in words is "one billion, six hundred forty-one million, five hundred thirty-four thousand, two hundred seventeen".