78159149 has 4 divisors (see below), whose sum is σ = 82756764. Its totient is φ = 73561536.

The previous prime is 78159139. The next prime is 78159187. The reversal of 78159149 is 94195187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35164900 + 42994249 = 5930^2 + 6557^2 .

It is a cyclic number.

It is not a de Polignac number, because 78159149 - 2¹² = 78155053 is a prime.

It is a super-2 number, since 2×78159149² = 12217705144808402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78159119) 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, 2298782 + ... + 2298815.

It is an arithmetic number, because the mean of its divisors is an integer number (20689191).

Almost surely, 2^78159149 is an apocalyptic number.

It is an amenable number.

78159149 is a deficient number, since it is larger than the sum of its proper divisors (4597615).

78159149 is a wasteful number, since it uses less digits than its factorization.

78159149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4597614.

The product of its digits is 90720, while the sum is 44.

The square root of 78159149 is about 8840.7663129392. The cubic root of 78159149 is about 427.5562644959.

The spelling of 78159149 in words is "seventy-eight million, one hundred fifty-nine thousand, one hundred forty-nine".