1143991425 has 48 divisors (see below), whose sum is σ = 1999872000. Its totient is φ = 575426880.

The previous prime is 1143991361. The next prime is 1143991427. The reversal of 1143991425 is 5241993411.

It is not a de Polignac number, because 1143991425 - 2⁶ = 1143991361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1143991427) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 338896 + ... + 342254.

It is an arithmetic number, because the mean of its divisors is an integer number (41664000).

Almost surely, 2^1143991425 is an apocalyptic number.

1143991425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1143991425 is a deficient number, since it is larger than the sum of its proper divisors (855880575).

1143991425 is a wasteful number, since it uses less digits than its factorization.

1143991425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3630 (or 3625 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 1143991425 is about 33822.9422877431. The cubic root of 1143991425 is about 1045.8616932076.

The spelling of 1143991425 in words is "one billion, one hundred forty-three million, nine hundred ninety-one thousand, four hundred twenty-five".