491751456 has 144 divisors (see below), whose sum is σ = 1517183136. Its totient is φ = 139044864.

The previous prime is 491751409. The next prime is 491751473. The reversal of 491751456 is 654157194.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 502840 + ... + 503816.

It is an arithmetic number, because the mean of its divisors is an integer number (10535994).

Almost surely, 2^491751456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491751456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758591568).

491751456 is an abundant number, since it is smaller than the sum of its proper divisors (1025431680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491751456 is a wasteful number, since it uses less digits than its factorization.

491751456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111 (or 1096 counting only the distinct ones).

The product of its digits is 151200, while the sum is 42.

The square root of 491751456 is about 22175.4696906289. The cubic root of 491751456 is about 789.3117201238.

The spelling of 491751456 in words is "four hundred ninety-one million, seven hundred fifty-one thousand, four hundred fifty-six".