1609989144 has 64 divisors (see below), whose sum is σ = 4297708800. Its totient is φ = 501384576.

The previous prime is 1609989137. The next prime is 1609989151. The reversal of 1609989144 is 4419899061.

1609989144 = T₈₆₃₂ + T₈₆₃₃ + ... + T₈₆₇₄.

It is an interprime number because it is at equal distance from previous prime (1609989137) and next prime (1609989151).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10179 + ... + 57650.

It is an arithmetic number, because the mean of its divisors is an integer number (67151700).

Almost surely, 2^1609989144 is an apocalyptic number.

It is an amenable number.

1609989144 is an abundant number, since it is smaller than the sum of its proper divisors (2687719656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1609989144 is a wasteful number, since it uses less digits than its factorization.

1609989144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67904 (or 67900 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 1609989144 is about 40124.6700173347. The cubic root of 1609989144 is about 1172.0360835649.

The spelling of 1609989144 in words is "one billion, six hundred nine million, nine hundred eighty-nine thousand, one hundred forty-four".