1851678113 has 2 divisors, whose sum is σ = 1851678114. Its totient is φ = 1851678112.

The previous prime is 1851678109. The next prime is 1851678133. The reversal of 1851678113 is 3118761581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1435803664 + 415874449 = 37892^2 + 20393^2 .

It is a cyclic number.

It is not a de Polignac number, because 1851678113 - 2² = 1851678109 is a prime.

It is not a weakly prime, because it can be changed into another prime (1851678133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925839056 + 925839057.

It is an arithmetic number, because the mean of its divisors is an integer number (925839057).

Almost surely, 2^1851678113 is an apocalyptic number.

It is an amenable number.

1851678113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851678113 is an equidigital number, since it uses as much as digits as its factorization.

1851678113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 41.

The square root of 1851678113 is about 43031.1295808046. The cubic root of 1851678113 is about 1227.9720947816.

The spelling of 1851678113 in words is "one billion, eight hundred fifty-one million, six hundred seventy-eight thousand, one hundred thirteen".