1161217378 has 4 divisors (see below), whose sum is σ = 1741826070. Its totient is φ = 580608688.

The previous prime is 1161217363. The next prime is 1161217381. The reversal of 1161217378 is 8737121611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 802758889 + 358458489 = 28333^2 + 18933^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290304343 + ... + 290304346.

Almost surely, 2^1161217378 is an apocalyptic number.

1161217378 is a deficient number, since it is larger than the sum of its proper divisors (580608692).

1161217378 is an equidigital number, since it uses as much as digits as its factorization.

1161217378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580608691.

The product of its digits is 14112, while the sum is 37.

The square root of 1161217378 is about 34076.6397697895. The cubic root of 1161217378 is about 1051.0850093424.

Adding to 1161217378 its reverse (8737121611), we get a palindrome (9898338989).

The spelling of 1161217378 in words is "one billion, one hundred sixty-one million, two hundred seventeen thousand, three hundred seventy-eight".