1913881225 has 6 divisors (see below), whose sum is σ = 2373212750. Its totient is φ = 1531104960.

The previous prime is 1913881163. The next prime is 1913881241. The reversal of 1913881225 is 5221883191.

It can be written as a sum of positive squares in 3 ways, for example, as 7772944 + 1906108281 = 2788^2 + 43659^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1913881225 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38277600 + ... + 38277649.

Almost surely, 2^1913881225 is an apocalyptic number.

It is an amenable number.

1913881225 is a deficient number, since it is larger than the sum of its proper divisors (459331525).

1913881225 is an equidigital number, since it uses as much as digits as its factorization.

1913881225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76555259 (or 76555254 counting only the distinct ones).

The product of its digits is 34560, while the sum is 40.

The square root of 1913881225 is about 43747.9282366605. The cubic root of 1913881225 is about 1241.5712878606.

The spelling of 1913881225 in words is "one billion, nine hundred thirteen million, eight hundred eighty-one thousand, two hundred twenty-five".