1915864481 has 2 divisors, whose sum is σ = 1915864482. Its totient is φ = 1915864480.

The previous prime is 1915864451. The next prime is 1915864493. The reversal of 1915864481 is 1844685191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1643086225 + 272778256 = 40535^2 + 16516^2 .

It is a cyclic number.

It is not a de Polignac number, because 1915864481 - 2⁶ = 1915864417 is a prime.

It is a super-2 number, since 2×1915864481² = 7341073419114798722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1915864421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 957932240 + 957932241.

It is an arithmetic number, because the mean of its divisors is an integer number (957932241).

Almost surely, 2^1915864481 is an apocalyptic number.

It is an amenable number.

1915864481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1915864481 is an equidigital number, since it uses as much as digits as its factorization.

1915864481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 47.

The square root of 1915864481 is about 43770.5892238156. The cubic root of 1915864481 is about 1241.9999984874. Note that the first 5 decimals are identical.

The spelling of 1915864481 in words is "one billion, nine hundred fifteen million, eight hundred sixty-four thousand, four hundred eighty-one".