1916118257 has 2 divisors, whose sum is σ = 1916118258. Its totient is φ = 1916118256.

The previous prime is 1916118233. The next prime is 1916118299. The reversal of 1916118257 is 7528116191.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1891902016 + 24216241 = 43496^2 + 4921^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916118257 - 2²⁸ = 1647682801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1916118857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958059128 + 958059129.

It is an arithmetic number, because the mean of its divisors is an integer number (958059129).

Almost surely, 2^1916118257 is an apocalyptic number.

It is an amenable number.

1916118257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916118257 is an equidigital number, since it uses as much as digits as its factorization.

1916118257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 41.

The square root of 1916118257 is about 43773.4880606972. The cubic root of 1916118257 is about 1242.0548346338.

The spelling of 1916118257 in words is "one billion, nine hundred sixteen million, one hundred eighteen thousand, two hundred fifty-seven".