1157292778 has 4 divisors (see below), whose sum is σ = 1735939170. Its totient is φ = 578646388.

The previous prime is 1157292769. The next prime is 1157292791. The reversal of 1157292778 is 8772927511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8772927511 = 42929 ⋅204359.

It can be written as a sum of positive squares in only one way, i.e., 581436769 + 575856009 = 24113^2 + 23997^2 .

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 as a sum of consecutive naturals, namely, 289323193 + ... + 289323196.

Almost surely, 2^1157292778 is an apocalyptic number.

1157292778 is a deficient number, since it is larger than the sum of its proper divisors (578646392).

1157292778 is an equidigital number, since it uses as much as digits as its factorization.

1157292778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578646391.

The product of its digits is 493920, while the sum is 49.

The square root of 1157292778 is about 34019.0061289274. The cubic root of 1157292778 is about 1049.8995453406.

The spelling of 1157292778 in words is "one billion, one hundred fifty-seven million, two hundred ninety-two thousand, seven hundred seventy-eight".