1131989554 has 4 divisors (see below), whose sum is σ = 1697984334. Its totient is φ = 565994776.

The previous prime is 1131989533. The next prime is 1131989561. The reversal of 1131989554 is 4559891311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4559891311 = 3041 ⋅1499471.

It can be written as a sum of positive squares in only one way, i.e., 742835025 + 389154529 = 27255^2 + 19727^2 .

It is a super-3 number, since 3×1131989554³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282997387 + ... + 282997390.

Almost surely, 2^1131989554 is an apocalyptic number.

1131989554 is a deficient number, since it is larger than the sum of its proper divisors (565994780).

1131989554 is an equidigital number, since it uses as much as digits as its factorization.

1131989554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565994779.

The product of its digits is 194400, while the sum is 46.

The square root of 1131989554 is about 33645.0524446017. The cubic root of 1131989554 is about 1042.1913710867.

The spelling of 1131989554 in words is "one billion, one hundred thirty-one million, nine hundred eighty-nine thousand, five hundred fifty-four".