1158761989 has 16 divisors (see below), whose sum is σ = 1491296256. Its totient is φ = 873802800.

The previous prime is 1158761977. The next prime is 1158762023. The reversal of 1158761989 is 9891678511.

It is a cyclic number.

It is not a de Polignac number, because 1158761989 - 2²¹ = 1156664837 is a prime.

It is a super-2 number, since 2×1158761989² = 2685458694302472242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1158761959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240337 + ... + 245110.

It is an arithmetic number, because the mean of its divisors is an integer number (93206016).

Almost surely, 2^1158761989 is an apocalyptic number.

It is an amenable number.

1158761989 is a deficient number, since it is larger than the sum of its proper divisors (332534267).

1158761989 is a wasteful number, since it uses less digits than its factorization.

1158761989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485496.

The product of its digits is 1088640, while the sum is 55.

The square root of 1158761989 is about 34040.5932527622. The cubic root of 1158761989 is about 1050.3436483636.

The spelling of 1158761989 in words is "one billion, one hundred fifty-eight million, seven hundred sixty-one thousand, nine hundred eighty-nine".