1158145621 has 8 divisors (see below), whose sum is σ = 1259415000. Its totient is φ = 1060558848.

The previous prime is 1158145619. The next prime is 1158145643. The reversal of 1158145621 is 1265418511.

It can be written as a sum of positive squares in 4 ways, for example, as 464876721 + 693268900 = 21561^2 + 26330^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1158145621 - 2¹ = 1158145619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1158145721) 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, 919996 + ... + 921253.

It is an arithmetic number, because the mean of its divisors is an integer number (157426875).

Almost surely, 2^1158145621 is an apocalyptic number.

It is an amenable number.

1158145621 is a deficient number, since it is larger than the sum of its proper divisors (101269379).

1158145621 is a wasteful number, since it uses less digits than its factorization.

1158145621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841303.

The product of its digits is 9600, while the sum is 34.

The square root of 1158145621 is about 34031.5386222839. The cubic root of 1158145621 is about 1050.1573826071.

The spelling of 1158145621 in words is "one billion, one hundred fifty-eight million, one hundred forty-five thousand, six hundred twenty-one".