1361892778 has 4 divisors (see below), whose sum is σ = 2042839170. Its totient is φ = 680946388.

The previous prime is 1361892757. The next prime is 1361892793. The reversal of 1361892778 is 8772981631.

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., 1359913129 + 1979649 = 36877^2 + 1407^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340473193 + ... + 340473196.

Almost surely, 2^1361892778 is an apocalyptic number.

1361892778 is a deficient number, since it is larger than the sum of its proper divisors (680946392).

1361892778 is an equidigital number, since it uses as much as digits as its factorization.

1361892778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680946391.

The product of its digits is 1016064, while the sum is 52.

The square root of 1361892778 is about 36903.8314812974. The cubic root of 1361892778 is about 1108.4454005035.

The spelling of 1361892778 in words is "one billion, three hundred sixty-one million, eight hundred ninety-two thousand, seven hundred seventy-eight".