1143521291 has 16 divisors (see below), whose sum is σ = 1304529408. Its totient is φ = 992217600.

The previous prime is 1143521219. The next prime is 1143521321. The reversal of 1143521291 is 1921253411.

It is not a de Polignac number, because 1143521291 - 2²⁶ = 1076412427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1143521791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118571 + ... + 127851.

It is an arithmetic number, because the mean of its divisors is an integer number (81533088).

Almost surely, 2^1143521291 is an apocalyptic number.

1143521291 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1143521291 is a deficient number, since it is larger than the sum of its proper divisors (161008117).

1143521291 is a wasteful number, since it uses less digits than its factorization.

1143521291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9802.

The product of its digits is 2160, while the sum is 29.

The square root of 1143521291 is about 33815.9916459654. The cubic root of 1143521291 is about 1045.7184046883.

The spelling of 1143521291 in words is "one billion, one hundred forty-three million, five hundred twenty-one thousand, two hundred ninety-one".