1153978049 has 4 divisors (see below), whose sum is σ = 1318832064. Its totient is φ = 989124036.

The previous prime is 1153978027. The next prime is 1153978061. The reversal of 1153978049 is 9408793511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9408793511 = 13 ⋅723753347.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1153978049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1153977994 and 1153978012.

It is not an unprimeable number, because it can be changed into a prime (1153978099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82426997 + ... + 82427010.

It is an arithmetic number, because the mean of its divisors is an integer number (329708016).

Almost surely, 2^1153978049 is an apocalyptic number.

It is an amenable number.

1153978049 is a deficient number, since it is larger than the sum of its proper divisors (164854015).

1153978049 is an equidigital number, since it uses as much as digits as its factorization.

1153978049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164854014.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 1153978049 is about 33970.2524129568. The cubic root of 1153978049 is about 1048.8962093819.

The spelling of 1153978049 in words is "one billion, one hundred fifty-three million, nine hundred seventy-eight thousand, forty-nine".