1155647489 has 8 divisors (see below), whose sum is σ = 1233938112. Its totient is φ = 1079694000.

The previous prime is 1155647459. The next prime is 1155647503. The reversal of 1155647489 is 9847465511.

1155647489 = T₇₃₁₀ + T₇₃₁₁ + ... + T₇₃₅₂.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155647489 is a prime.

It is a super-2 number, since 2×1155647489² = 2671042237664010242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155647459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583262 + ... + 585239.

It is an arithmetic number, because the mean of its divisors is an integer number (154242264).

Almost surely, 2^1155647489 is an apocalyptic number.

It is an amenable number.

1155647489 is a deficient number, since it is larger than the sum of its proper divisors (78290623).

1155647489 is a wasteful number, since it uses less digits than its factorization.

1155647489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168567.

The product of its digits is 1209600, while the sum is 50.

The square root of 1155647489 is about 33994.8156194441. The cubic root of 1155647489 is about 1049.4017723064.

The spelling of 1155647489 in words is "one billion, one hundred fifty-five million, six hundred forty-seven thousand, four hundred eighty-nine".