1121399899 has 2 divisors, whose sum is σ = 1121399900. Its totient is φ = 1121399898.

The previous prime is 1121399887. The next prime is 1121399933. The reversal of 1121399899 is 9989931211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1121399899 - 2⁷ = 1121399771 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121399099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560699949 + 560699950.

It is an arithmetic number, because the mean of its divisors is an integer number (560699950).

Almost surely, 2^1121399899 is an apocalyptic number.

1121399899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121399899 is an equidigital number, since it uses as much as digits as its factorization.

1121399899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 52.

The square root of 1121399899 is about 33487.3095216681. The cubic root of 1121399899 is about 1038.9313168514.

The spelling of 1121399899 in words is "one billion, one hundred twenty-one million, three hundred ninety-nine thousand, eight hundred ninety-nine".