1161401818 has 16 divisors (see below), whose sum is σ = 1854147240. Its totient is φ = 543707136.

The previous prime is 1161401777. The next prime is 1161401827. The reversal of 1161401818 is 8181041611.

It can be written as a sum of positive squares in 4 ways, for example, as 781034809 + 380367009 = 27947^2 + 19503^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1161401818.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81933 + ... + 95056.

Almost surely, 2^1161401818 is an apocalyptic number.

1161401818 is a deficient number, since it is larger than the sum of its proper divisors (692745422).

1161401818 is a wasteful number, since it uses less digits than its factorization.

1161401818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177201.

The product of its (nonzero) digits is 1536, while the sum is 31.

The square root of 1161401818 is about 34079.3459150847. The cubic root of 1161401818 is about 1051.1406555001.

The spelling of 1161401818 in words is "one billion, one hundred sixty-one million, four hundred one thousand, eight hundred eighteen".