1914521999 has 4 divisors (see below), whose sum is σ = 2061792936. Its totient is φ = 1767251064.

The previous prime is 1914521993. The next prime is 1914522007. The reversal of 1914521999 is 9991254191.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1914521999 - 2¹² = 1914517903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1914521993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73635449 + ... + 73635474.

It is an arithmetic number, because the mean of its divisors is an integer number (515448234).

Almost surely, 2^1914521999 is an apocalyptic number.

1914521999 is a deficient number, since it is larger than the sum of its proper divisors (147270937).

1914521999 is a wasteful number, since it uses less digits than its factorization.

1914521999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147270936.

The product of its digits is 262440, while the sum is 50.

The square root of 1914521999 is about 43755.2511020106. The cubic root of 1914521999 is about 1241.7098331754.

The spelling of 1914521999 in words is "one billion, nine hundred fourteen million, five hundred twenty-one thousand, nine hundred ninety-nine".