1161598459 has 18 divisors (see below), whose sum is σ = 1423639980. Its totient is φ = 942408432.

The previous prime is 1161598441. The next prime is 1161598481. The reversal of 1161598459 is 9548951611.

It is a happy number.

It is not a de Polignac number, because 1161598459 - 2⁷ = 1161598331 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (1161598409) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1039369 + ... + 1040485.

It is an arithmetic number, because the mean of its divisors is an integer number (79091110).

Almost surely, 2^1161598459 is an apocalyptic number.

1161598459 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1161598459 is a deficient number, since it is larger than the sum of its proper divisors (262041521).

1161598459 is an frugal number, since it uses more digits than its factorization.

1161598459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2267 (or 1143 counting only the distinct ones).

The product of its digits is 388800, while the sum is 49.

The square root of 1161598459 is about 34082.2308395445. The cubic root of 1161598459 is about 1051.1999762514.

The spelling of 1161598459 in words is "one billion, one hundred sixty-one million, five hundred ninety-eight thousand, four hundred fifty-nine".