1989167551 has 16 divisors (see below), whose sum is σ = 2394466560. Its totient is φ = 1614263040.

The previous prime is 1989167503. The next prime is 1989167591. The reversal of 1989167551 is 1557619891.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1989167551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989167591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273180 + ... + 280366.

It is an arithmetic number, because the mean of its divisors is an integer number (149654160).

Almost surely, 2^1989167551 is an apocalyptic number.

1989167551 is a deficient number, since it is larger than the sum of its proper divisors (405299009).

1989167551 is a wasteful number, since it uses less digits than its factorization.

1989167551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9294.

The product of its digits is 680400, while the sum is 52.

The square root of 1989167551 is about 44600.0846523860. The cubic root of 1989167551 is about 1257.6422590291.

The spelling of 1989167551 in words is "one billion, nine hundred eighty-nine million, one hundred sixty-seven thousand, five hundred fifty-one".