6491288421 has 12 divisors (see below), whose sum is σ = 9869795520. Its totient is φ = 4099761000.

The previous prime is 6491288417. The next prime is 6491288423. The reversal of 6491288421 is 1248821946.

6491288421 is a `hidden beast` number, since 64 + 91 + 2 + 88 + 421 = 666.

It is not a de Polignac number, because 6491288421 - 2² = 6491288417 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491288423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18980205 + ... + 18980546.

It is an arithmetic number, because the mean of its divisors is an integer number (822482960).

Almost surely, 2^6491288421 is an apocalyptic number.

It is an amenable number.

6491288421 is a deficient number, since it is larger than the sum of its proper divisors (3378507099).

6491288421 is a wasteful number, since it uses less digits than its factorization.

6491288421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37960776 (or 37960773 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 6491288421 is about 80568.5324490896. The cubic root of 6491288421 is about 1865.4214603801.

The spelling of 6491288421 in words is "six billion, four hundred ninety-one million, two hundred eighty-eight thousand, four hundred twenty-one".