919985087 has 4 divisors (see below), whose sum is σ = 1051411536. Its totient is φ = 788558640.

The previous prime is 919985083. The next prime is 919985089. The reversal of 919985087 is 780589919.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780589919 = 18593 ⋅41983.

It is a cyclic number.

It is not a de Polignac number, because 919985087 - 2² = 919985083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919985083) 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, 65713214 + ... + 65713227.

It is an arithmetic number, because the mean of its divisors is an integer number (262852884).

Almost surely, 2^919985087 is an apocalyptic number.

919985087 is a deficient number, since it is larger than the sum of its proper divisors (131426449).

919985087 is a wasteful number, since it uses less digits than its factorization.

919985087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131426448.

The product of its (nonzero) digits is 1632960, while the sum is 56.

The square root of 919985087 is about 30331.2559416850. The cubic root of 919985087 is about 972.5835710393.

The spelling of 919985087 in words is "nine hundred nineteen million, nine hundred eighty-five thousand, eighty-seven".