1145961894 has 64 divisors (see below), whose sum is σ = 2880110592. Its totient is φ = 295293600.

The previous prime is 1145961881. The next prime is 1145961907. The reversal of 1145961894 is 4981695411.

It is an interprime number because it is at equal distance from previous prime (1145961881) and next prime (1145961907).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48909 + ... + 68439.

It is an arithmetic number, because the mean of its divisors is an integer number (45001728).

Almost surely, 2^1145961894 is an apocalyptic number.

1145961894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1145961894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1440055296).

1145961894 is an abundant number, since it is smaller than the sum of its proper divisors (1734148698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1145961894 is a wasteful number, since it uses less digits than its factorization.

1145961894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19681.

The product of its digits is 311040, while the sum is 48.

The square root of 1145961894 is about 33852.0589329512. The cubic root of 1145961894 is about 1046.4618305571.

It can be divided in two parts, 1145961 and 894, that added together give a triangular number (1146855 = T₁₅₁₄).

The spelling of 1145961894 in words is "one billion, one hundred forty-five million, nine hundred sixty-one thousand, eight hundred ninety-four".