158618749 has 4 divisors (see below), whose sum is σ = 161993664. Its totient is φ = 155243836.

The previous prime is 158618743. The next prime is 158618753. The reversal of 158618749 is 947816851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 947816851 = 3253 ⋅291367.

It is a cyclic number.

It is not a de Polignac number, because 158618749 - 2⁹ = 158618237 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158618743) 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, 1687387 + ... + 1687480.

It is an arithmetic number, because the mean of its divisors is an integer number (40498416).

Almost surely, 2^158618749 is an apocalyptic number.

It is an amenable number.

158618749 is a deficient number, since it is larger than the sum of its proper divisors (3374915).

158618749 is an equidigital number, since it uses as much as digits as its factorization.

158618749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3374914.

The product of its digits is 483840, while the sum is 49.

The square root of 158618749 is about 12594.3935542764. The cubic root of 158618749 is about 541.3168012034.

The spelling of 158618749 in words is "one hundred fifty-eight million, six hundred eighteen thousand, seven hundred forty-nine".