158581945 has 4 divisors (see below), whose sum is σ = 190298340. Its totient is φ = 126865552.

The previous prime is 158581939. The next prime is 158581949. The reversal of 158581945 is 549185851.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549185851 = 83 ⋅6616697.

It can be written as a sum of positive squares in 2 ways, for example, as 17732521 + 140849424 = 4211^2 + 11868^2 .

It is a cyclic number.

It is not a de Polignac number, because 158581945 - 2²¹ = 156484793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 158581895 and 158581904.

It is not an unprimeable number, because it can be changed into a prime (158581949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15858190 + ... + 15858199.

It is an arithmetic number, because the mean of its divisors is an integer number (47574585).

Almost surely, 2^158581945 is an apocalyptic number.

It is an amenable number.

158581945 is a deficient number, since it is larger than the sum of its proper divisors (31716395).

158581945 is an equidigital number, since it uses as much as digits as its factorization.

158581945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31716394.

The product of its digits is 288000, while the sum is 46.

The square root of 158581945 is about 12592.9323431836. The cubic root of 158581945 is about 541.2749310699.

The spelling of 158581945 in words is "one hundred fifty-eight million, five hundred eighty-one thousand, nine hundred forty-five".