1151986561 has 8 divisors (see below), whose sum is σ = 1262203200. Its totient is φ = 1042685040.

The previous prime is 1151986519. The next prime is 1151986597. The reversal of 1151986561 is 1656891511.

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-1151986561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1151986961) 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, 226141 + ... + 231178.

It is an arithmetic number, because the mean of its divisors is an integer number (157775400).

Almost surely, 2^1151986561 is an apocalyptic number.

1151986561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1151986561 is a deficient number, since it is larger than the sum of its proper divisors (110216639).

1151986561 is a wasteful number, since it uses less digits than its factorization.

1151986561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457559.

The product of its digits is 64800, while the sum is 43.

The square root of 1151986561 is about 33940.9275212096. The cubic root of 1151986561 is about 1048.2924812622.

The spelling of 1151986561 in words is "one billion, one hundred fifty-one million, nine hundred eighty-six thousand, five hundred sixty-one".