919897487 has 4 divisors (see below), whose sum is σ = 951618120. Its totient is φ = 888176856.

The previous prime is 919897481. The next prime is 919897493. The reversal of 919897487 is 784798919.

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

It is an interprime number because it is at equal distance from previous prime (919897481) and next prime (919897493).

It is a cyclic number.

It is not a de Polignac number, because 919897487 - 2⁶ = 919897423 is a prime.

It is a super-2 number, since 2×919897487² = 1692422773177830338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919897481) 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, 15860273 + ... + 15860330.

It is an arithmetic number, because the mean of its divisors is an integer number (237904530).

Almost surely, 2^919897487 is an apocalyptic number.

919897487 is a deficient number, since it is larger than the sum of its proper divisors (31720633).

919897487 is a wasteful number, since it uses less digits than its factorization.

919897487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31720632.

The product of its digits is 9144576, while the sum is 62.

The square root of 919897487 is about 30329.8118523673. The cubic root of 919897487 is about 972.5527006023.

The spelling of 919897487 in words is "nine hundred nineteen million, eight hundred ninety-seven thousand, four hundred eighty-seven".