1161212345 has 16 divisors (see below), whose sum is σ = 1442938320. Its totient is φ = 896044800.

The previous prime is 1161212333. The next prime is 1161212357. The reversal of 1161212345 is 5432121611.

It is an interprime number because it is at equal distance from previous prime (1161212333) and next prime (1161212357).

It can be written as a sum of positive squares in 8 ways, for example, as 27678121 + 1133534224 = 5261^2 + 33668^2 .

It is not a de Polignac number, because 1161212345 - 2⁸ = 1161212089 is a prime.

It is a super-2 number, since 2×1161212345² = 2696828220360798050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167855 + ... + 174635.

It is an arithmetic number, because the mean of its divisors is an integer number (90183645).

Almost surely, 2^1161212345 is an apocalyptic number.

It is an amenable number.

1161212345 is a deficient number, since it is larger than the sum of its proper divisors (281725975).

1161212345 is a wasteful number, since it uses less digits than its factorization.

1161212345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7996.

The product of its digits is 1440, while the sum is 26.

The square root of 1161212345 is about 34076.5659214657. The cubic root of 1161212345 is about 1051.0834907871.

Adding to 1161212345 its reverse (5432121611), we get a palindrome (6593333956).

The spelling of 1161212345 in words is "one billion, one hundred sixty-one million, two hundred twelve thousand, three hundred forty-five".