1123557899 has 4 divisors (see below), whose sum is σ = 1123731840. Its totient is φ = 1123383960.

The previous prime is 1123557871. The next prime is 1123557901. The reversal of 1123557899 is 9987553211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9987553211 = 89 ⋅112219699.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123557899 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1123557839) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76892 + ... + 90329.

It is an arithmetic number, because the mean of its divisors is an integer number (280932960).

Almost surely, 2^1123557899 is an apocalyptic number.

1123557899 is a deficient number, since it is larger than the sum of its proper divisors (173941).

1123557899 is an equidigital number, since it uses as much as digits as its factorization.

1123557899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173940.

The product of its digits is 680400, while the sum is 50.

The square root of 1123557899 is about 33519.5151963748. The cubic root of 1123557899 is about 1039.5973228429.

The spelling of 1123557899 in words is "one billion, one hundred twenty-three million, five hundred fifty-seven thousand, eight hundred ninety-nine".