1158216961 has 12 divisors (see below), whose sum is σ = 1281532672. Its totient is φ = 1045935000.

The previous prime is 1158216949. The next prime is 1158216967. The reversal of 1158216961 is 1696128511.

It is not a de Polignac number, because 1158216961 - 2⁷ = 1158216833 is a prime.

It is a super-3 number, since 3×1158216961³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1158216967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13425 + ... + 49966.

Almost surely, 2^1158216961 is an apocalyptic number.

1158216961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1158216961 is a deficient number, since it is larger than the sum of its proper divisors (123315711).

1158216961 is a wasteful number, since it uses less digits than its factorization.

1158216961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63564 (or 63553 counting only the distinct ones).

The product of its digits is 25920, while the sum is 40.

The square root of 1158216961 is about 34032.5867515239. The cubic root of 1158216961 is about 1050.1789448609.

The spelling of 1158216961 in words is "one billion, one hundred fifty-eight million, two hundred sixteen thousand, nine hundred sixty-one".