158978903 has 4 divisors (see below), whose sum is σ = 159079440. Its totient is φ = 158878368.

The previous prime is 158978891. The next prime is 158978933. The reversal of 158978903 is 309879851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 309879851 = 23 ⋅13473037.

It is a cyclic number.

It is not a de Polignac number, because 158978903 - 2⁶ = 158978839 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 (158978933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47858 + ... + 51071.

It is an arithmetic number, because the mean of its divisors is an integer number (39769860).

Almost surely, 2^158978903 is an apocalyptic number.

158978903 is a deficient number, since it is larger than the sum of its proper divisors (100537).

158978903 is an equidigital number, since it uses as much as digits as its factorization.

158978903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100536.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 158978903 is about 12608.6836347019. The cubic root of 158978903 is about 541.7261896351.

The spelling of 158978903 in words is "one hundred fifty-eight million, nine hundred seventy-eight thousand, nine hundred three".