921288465 has 16 divisors (see below), whose sum is σ = 1637846400. Its totient is φ = 491353776.

The previous prime is 921288461. The next prime is 921288469. The reversal of 921288465 is 564882129.

It is an interprime number because it is at equal distance from previous prime (921288461) and next prime (921288469).

It is not a de Polignac number, because 921288465 - 2² = 921288461 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 921288465.

It is not an unprimeable number, because it can be changed into a prime (921288461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3412045 + ... + 3412314.

It is an arithmetic number, because the mean of its divisors is an integer number (102365400).

Almost surely, 2^921288465 is an apocalyptic number.

It is an amenable number.

921288465 is a deficient number, since it is larger than the sum of its proper divisors (716557935).

921288465 is a wasteful number, since it uses less digits than its factorization.

921288465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6824373 (or 6824367 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 921288465 is about 30352.7340613659. The cubic root of 921288465 is about 973.0426530681.

The spelling of 921288465 in words is "nine hundred twenty-one million, two hundred eighty-eight thousand, four hundred sixty-five".