1913521538 has 16 divisors (see below), whose sum is σ = 2923452000. Its totient is φ = 939192672.

The previous prime is 1913521517. The next prime is 1913521583. The reversal of 1913521538 is 8351253191.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13928 + ... + 63411.

It is an arithmetic number, because the mean of its divisors is an integer number (182715750).

Almost surely, 2^1913521538 is an apocalyptic number.

1913521538 is a deficient number, since it is larger than the sum of its proper divisors (1009930462).

1913521538 is a wasteful number, since it uses less digits than its factorization.

1913521538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77569.

The product of its digits is 32400, while the sum is 38.

The square root of 1913521538 is about 43743.8171402542. The cubic root of 1913521538 is about 1241.4935043797.

The spelling of 1913521538 in words is "one billion, nine hundred thirteen million, five hundred twenty-one thousand, five hundred thirty-eight".