158642819 has 4 divisors (see below), whose sum is σ = 159592944. Its totient is φ = 157692696.

The previous prime is 158642777. The next prime is 158642831. The reversal of 158642819 is 918246851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 918246851 = 7417 ⋅123803.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158642819 is a prime.

It is a super-2 number, since 2×158642819² = 50335088040533522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 158642819.

It is not an unprimeable number, because it can be changed into a prime (158642839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474812 + ... + 475145.

It is an arithmetic number, because the mean of its divisors is an integer number (39898236).

Almost surely, 2^158642819 is an apocalyptic number.

158642819 is a deficient number, since it is larger than the sum of its proper divisors (950125).

158642819 is an equidigital number, since it uses as much as digits as its factorization.

158642819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950124.

The product of its digits is 138240, while the sum is 44.

The square root of 158642819 is about 12595.3491019503. The cubic root of 158642819 is about 541.3441809772.

The spelling of 158642819 in words is "one hundred fifty-eight million, six hundred forty-two thousand, eight hundred nineteen".