919539457 has 4 divisors (see below), whose sum is σ = 920708656. Its totient is φ = 918370260.

The previous prime is 919539433. The next prime is 919539473. The reversal of 919539457 is 754935919.

It is a happy number.

919539457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 754935919 = 2753 ⋅274223.

It is a cyclic number.

It is not a de Polignac number, because 919539457 - 2¹⁵ = 919506689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (919539157) 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, 583419 + ... + 584992.

It is an arithmetic number, because the mean of its divisors is an integer number (230177164).

Almost surely, 2^919539457 is an apocalyptic number.

It is an amenable number.

919539457 is a deficient number, since it is larger than the sum of its proper divisors (1169199).

919539457 is a wasteful number, since it uses less digits than its factorization.

919539457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169198.

The product of its digits is 1530900, while the sum is 52.

The square root of 919539457 is about 30323.9089993358. The cubic root of 919539457 is about 972.4265096472.

The spelling of 919539457 in words is "nine hundred nineteen million, five hundred thirty-nine thousand, four hundred fifty-seven".