1143531394 has 4 divisors (see below), whose sum is σ = 1715297094. Its totient is φ = 571765696.

The previous prime is 1143531391. The next prime is 1143531409. The reversal of 1143531394 is 4931353411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 958707369 + 184824025 = 30963^2 + 13595^2 .

It is not an unprimeable number, because it can be changed into a prime (1143531391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 285882847 + ... + 285882850.

Almost surely, 2^1143531394 is an apocalyptic number.

1143531394 is a deficient number, since it is larger than the sum of its proper divisors (571765700).

1143531394 is an equidigital number, since it uses as much as digits as its factorization.

1143531394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571765699.

The product of its digits is 19440, while the sum is 34.

The square root of 1143531394 is about 33816.1410276217. The cubic root of 1143531394 is about 1045.7214843167.

The spelling of 1143531394 in words is "one billion, one hundred forty-three million, five hundred thirty-one thousand, three hundred ninety-four".