1916345521 has 2 divisors, whose sum is σ = 1916345522. Its totient is φ = 1916345520.

The previous prime is 1916345489. The next prime is 1916345527. The reversal of 1916345521 is 1255436191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1574502400 + 341843121 = 39680^2 + 18489^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916345521 - 2⁵ = 1916345489 is a prime.

It is a super-2 number, since 2×1916345521² = 7344760311713522882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1916345527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958172760 + 958172761.

It is an arithmetic number, because the mean of its divisors is an integer number (958172761).

Almost surely, 2^1916345521 is an apocalyptic number.

It is an amenable number.

1916345521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916345521 is an equidigital number, since it uses as much as digits as its factorization.

1916345521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 37.

The square root of 1916345521 is about 43776.0838929203. The cubic root of 1916345521 is about 1242.1039379342.

The spelling of 1916345521 in words is "one billion, nine hundred sixteen million, three hundred forty-five thousand, five hundred twenty-one".