1491291000 has 576 divisors, whose sum is σ = 5841370080. Its totient is φ = 354585600.

The previous prime is 1491290971. The next prime is 1491291001. The reversal of 1491291000 is 1921941.

1491291000 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491291001) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 78488991 + ... + 78489009.

Almost surely, 2^1491291000 is an apocalyptic number.

1491291000 is a gapful number since it is divisible by the number (10) 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 1491291000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2920685040).

1491291000 is an abundant number, since it is smaller than the sum of its proper divisors (4350079080).

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

1491291000 is a wasteful number, since it uses less digits than its factorization.

1491291000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1491291000 is about 38617.2370839759. The cubic root of 1491291000 is about 1142.4945374946.

The spelling of 1491291000 in words is "one billion, four hundred ninety-one million, two hundred ninety-one thousand".