1143263485 has 64 divisors (see below), whose sum is σ = 1739630592. Its totient is φ = 702038016.

The previous prime is 1143263483. The next prime is 1143263509. The reversal of 1143263485 is 5843623411.

It is a 7-Lehmer number, since φ(1143263485) divides (1143263485-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 1143263485 - 2¹ = 1143263483 is a prime.

It is a super-2 number, since 2×1143263485² = 2614102792268690450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143263483) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4127167 + ... + 4127443.

It is an arithmetic number, because the mean of its divisors is an integer number (27181728).

Almost surely, 2^1143263485 is an apocalyptic number.

1143263485 is the 21385-th heptagonal number.

It is an amenable number.

1143263485 is a deficient number, since it is larger than the sum of its proper divisors (596367107).

1143263485 is a wasteful number, since it uses less digits than its factorization.

1143263485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542.

The product of its digits is 69120, while the sum is 37.

The square root of 1143263485 is about 33812.1795363742. The cubic root of 1143263485 is about 1045.6398133105.

Adding to 1143263485 its reverse (5843623411), we get a palindrome (6986886896).

It can be divided in two parts, 1143 and 263485, that added together give a triangular number (264628 = T₇₂₇).

The spelling of 1143263485 in words is "one billion, one hundred forty-three million, two hundred sixty-three thousand, four hundred eighty-five".