2078159381 has 4 divisors (see below), whose sum is σ = 2079377100. Its totient is φ = 2076941664.

The previous prime is 2078159351. The next prime is 2078159389. The reversal of 2078159381 is 1839518702.

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 245548900 + 1832610481 = 15670^2 + 42809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2078159381 is a prime.

It is a super-2 number, since 2×2078159381² = 8637492825676606322, 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 (2078159389) 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, 606296 + ... + 609713.

It is an arithmetic number, because the mean of its divisors is an integer number (519844275).

Almost surely, 2^2078159381 is an apocalyptic number.

It is an amenable number.

2078159381 is a deficient number, since it is larger than the sum of its proper divisors (1217719).

2078159381 is a wasteful number, since it uses less digits than its factorization.

2078159381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217718.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 2078159381 is about 45586.8334171173. The cubic root of 2078159381 is about 1276.1242179248.

The spelling of 2078159381 in words is "two billion, seventy-eight million, one hundred fifty-nine thousand, three hundred eighty-one".