1491125472 has 144 divisors (see below), whose sum is σ = 4481568000. Its totient is φ = 468986112.

The previous prime is 1491125459. The next prime is 1491125473. The reversal of 1491125472 is 2745211941.

1491125472 is a `hidden beast` number, since 1 + 491 + 125 + 47 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491125473) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2073529 + ... + 2074247.

It is an arithmetic number, because the mean of its divisors is an integer number (31122000).

Almost surely, 2^1491125472 is an apocalyptic number.

1491125472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1491125472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2240784000).

1491125472 is an abundant number, since it is smaller than the sum of its proper divisors (2990442528).

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

1491125472 is a wasteful number, since it uses less digits than its factorization.

1491125472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1122 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 1491125472 is about 38615.0938364780. The cubic root of 1491125472 is about 1142.4522649864.

The spelling of 1491125472 in words is "one billion, four hundred ninety-one million, one hundred twenty-five thousand, four hundred seventy-two".