2078731813 has 2 divisors, whose sum is σ = 2078731814. Its totient is φ = 2078731812.

The previous prime is 2078731801. The next prime is 2078731847. The reversal of 2078731813 is 3181378702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1847022529 + 231709284 = 42977^2 + 15222^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2078731813 is a prime.

It is a super-2 number, since 2×2078731813² = 8642251900756533938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2078731313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1039365906 + 1039365907.

It is an arithmetic number, because the mean of its divisors is an integer number (1039365907).

Almost surely, 2^2078731813 is an apocalyptic number.

It is an amenable number.

2078731813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2078731813 is an equidigital number, since it uses as much as digits as its factorization.

2078731813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 2078731813 is about 45593.1114643429. Note that the first 3 decimals coincide. The cubic root of 2078731813 is about 1276.2413772539.

The spelling of 2078731813 in words is "two billion, seventy-eight million, seven hundred thirty-one thousand, eight hundred thirteen".