1914253991 has 4 divisors (see below), whose sum is σ = 2061504312. Its totient is φ = 1767003672.

The previous prime is 1914253987. The next prime is 1914254003. The reversal of 1914253991 is 1993524191.

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 1914253991 - 2² = 1914253987 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 (1914253921) 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, 73625141 + ... + 73625166.

It is an arithmetic number, because the mean of its divisors is an integer number (515376078).

Almost surely, 2^1914253991 is an apocalyptic number.

1914253991 is a deficient number, since it is larger than the sum of its proper divisors (147250321).

1914253991 is a wasteful number, since it uses less digits than its factorization.

1914253991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147250320.

The product of its digits is 87480, while the sum is 44.

The square root of 1914253991 is about 43752.1884138382. The cubic root of 1914253991 is about 1241.6518894347.

The spelling of 1914253991 in words is "one billion, nine hundred fourteen million, two hundred fifty-three thousand, nine hundred ninety-one".