1641263489 has 4 divisors (see below), whose sum is σ = 1653071280. Its totient is φ = 1629455700.

The previous prime is 1641263461. The next prime is 1641263527. The reversal of 1641263489 is 9843621461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9843621461 = 72277 ⋅136193.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641263489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641263089) 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, 5903687 + ... + 5903964.

It is an arithmetic number, because the mean of its divisors is an integer number (413267820).

Almost surely, 2^1641263489 is an apocalyptic number.

It is an amenable number.

1641263489 is a deficient number, since it is larger than the sum of its proper divisors (11807791).

1641263489 is a wasteful number, since it uses less digits than its factorization.

1641263489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11807790.

The product of its digits is 248832, while the sum is 44.

The square root of 1641263489 is about 40512.5102776908. The cubic root of 1641263489 is about 1179.5764756526.

The spelling of 1641263489 in words is "one billion, six hundred forty-one million, two hundred sixty-three thousand, four hundred eighty-nine".