1151523778 has 4 divisors (see below), whose sum is σ = 1727285670. Its totient is φ = 575761888.

The previous prime is 1151523767. The next prime is 1151523817. The reversal of 1151523778 is 8773251511.

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., 612216049 + 539307729 = 24743^2 + 23223^2 .

It is a super-2 number, since 2×1151523778² = 2652014022598786568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1151523778.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 287880943 + ... + 287880946.

Almost surely, 2^1151523778 is an apocalyptic number.

1151523778 is a deficient number, since it is larger than the sum of its proper divisors (575761892).

1151523778 is an equidigital number, since it uses as much as digits as its factorization.

1151523778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575761891.

The product of its digits is 58800, while the sum is 40.

The square root of 1151523778 is about 33934.1093591684. The cubic root of 1151523778 is about 1048.1520869979.

The spelling of 1151523778 in words is "one billion, one hundred fifty-one million, five hundred twenty-three thousand, seven hundred seventy-eight".