1617896989 has 4 divisors (see below), whose sum is σ = 1618067740. Its totient is φ = 1617726240.

The previous prime is 1617896977. The next prime is 1617896993. The reversal of 1617896989 is 9896987161.

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 764964964 + 852932025 = 27658^2 + 29205^2 .

It is a cyclic number.

It is not a de Polignac number, because 1617896989 - 2⁵ = 1617896957 is a prime.

It is a super-2 number, since 2×1617896989² = 5235181334030532242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1617896989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1617896909) 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, 70272 + ... + 90409.

It is an arithmetic number, because the mean of its divisors is an integer number (404516935).

Almost surely, 2^1617896989 is an apocalyptic number.

It is an amenable number.

1617896989 is a deficient number, since it is larger than the sum of its proper divisors (170751).

1617896989 is a wasteful number, since it uses less digits than its factorization.

1617896989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170750.

The product of its digits is 11757312, while the sum is 64.

The square root of 1617896989 is about 40223.0902467724. The cubic root of 1617896989 is about 1173.9518618038.

The spelling of 1617896989 in words is "one billion, six hundred seventeen million, eight hundred ninety-six thousand, nine hundred eighty-nine".