1161778 has 4 divisors (see below), whose sum is σ = 1742670. Its totient is φ = 580888.

The previous prime is 1161767. The next prime is 1161781. The reversal of 1161778 is 8771611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8771611 = 1297 ⋅6763.

It can be written as a sum of positive squares in only one way, i.e., 1159929 + 1849 = 1077^2 + 43^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290443 + ... + 290446.

2^1161778 is an apocalyptic number.

1161778 is a deficient number, since it is larger than the sum of its proper divisors (580892).

1161778 is an equidigital number, since it uses as much as digits as its factorization.

1161778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580891.

The product of its digits is 2352, while the sum is 31.

The square root of 1161778 is about 1077.8580611565. The cubic root of 1161778 is about 105.1254132594.

The spelling of 1161778 in words is "one million, one hundred sixty-one thousand, seven hundred seventy-eight".