1119431821 has 2 divisors, whose sum is σ = 1119431822. Its totient is φ = 1119431820.

The previous prime is 1119431777. The next prime is 1119431837. The reversal of 1119431821 is 1281349111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 888695721 + 230736100 = 29811^2 + 15190^2 .

It is a cyclic number.

It is not a de Polignac number, because 1119431821 - 2⁷ = 1119431693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1119431851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 559715910 + 559715911.

It is an arithmetic number, because the mean of its divisors is an integer number (559715911).

Almost surely, 2^1119431821 is an apocalyptic number.

It is an amenable number.

1119431821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1119431821 is an equidigital number, since it uses as much as digits as its factorization.

1119431821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 31.

The square root of 1119431821 is about 33457.9111870421. The cubic root of 1119431821 is about 1038.3231795881.

The spelling of 1119431821 in words is "one billion, one hundred nineteen million, four hundred thirty-one thousand, eight hundred twenty-one".