1143643621 has 8 divisors (see below), whose sum is σ = 1168527744. Its totient is φ = 1118782560.

The previous prime is 1143643591. The next prime is 1143643639. The reversal of 1143643621 is 1263463411.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1143643621 - 2¹⁹ = 1143119333 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 (1143643121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127401 + ... + 136081.

It is an arithmetic number, because the mean of its divisors is an integer number (146065968).

Almost surely, 2^1143643621 is an apocalyptic number.

It is an amenable number.

1143643621 is a deficient number, since it is larger than the sum of its proper divisors (24884123).

1143643621 is an equidigital number, since it uses as much as digits as its factorization.

1143643621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11531.

The product of its digits is 10368, while the sum is 31.

The square root of 1143643621 is about 33817.8003572083. The cubic root of 1143643621 is about 1045.7556924858.

The spelling of 1143643621 in words is "one billion, one hundred forty-three million, six hundred forty-three thousand, six hundred twenty-one".