1889553961 has 9 divisors (see below), whose sum is σ = 2008027749. Its totient is φ = 1777708224.

The previous prime is 1889553959. The next prime is 1889553997. The reversal of 1889553961 is 1693559881.

The square root of 1889553961 is 43469.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 93489561 + 1796064400 = 9669^2 + 42380^2 .

It is not a de Polignac number, because 1889553961 - 2¹ = 1889553959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1889563961) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 737695 + ... + 740251.

Almost surely, 2^1889553961 is an apocalyptic number.

1889553961 is the 43469-th square number.

1889553961 is the 21735-th centered octagonal number.

It is an amenable number.

1889553961 is a deficient number, since it is larger than the sum of its proper divisors (118473788).

1889553961 is an frugal number, since it uses more digits than its factorization.

1889553961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5148 (or 2574 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 55.

The cubic root of 1889553961 is about 1236.2883201753.

The spelling of 1889553961 in words is "one billion, eight hundred eighty-nine million, five hundred fifty-three thousand, nine hundred sixty-one".