1143954431 has 4 divisors (see below), whose sum is σ = 1145046000. Its totient is φ = 1142862864.

The previous prime is 1143954421. The next prime is 1143954433. The reversal of 1143954431 is 1344593411.

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

It is a cyclic number.

It is not a de Polignac number, because 1143954431 - 2¹⁰ = 1143953407 is a prime.

It is a super-2 number, since 2×1143954431² = 2617263480409067522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1143954391 and 1143954400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143954433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544211 + ... + 546308.

It is an arithmetic number, because the mean of its divisors is an integer number (286261500).

Almost surely, 2^1143954431 is an apocalyptic number.

1143954431 is a deficient number, since it is larger than the sum of its proper divisors (1091569).

1143954431 is a wasteful number, since it uses less digits than its factorization.

1143954431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091568.

The product of its digits is 25920, while the sum is 35.

The square root of 1143954431 is about 33822.3954060028. The cubic root of 1143954431 is about 1045.8504195145.

The spelling of 1143954431 in words is "one billion, one hundred forty-three million, nine hundred fifty-four thousand, four hundred thirty-one".