1491275988 has 48 divisors (see below), whose sum is σ = 3870303360. Its totient is φ = 496573632.

The previous prime is 1491275983. The next prime is 1491276011. The reversal of 1491275988 is 8895721941.

It is a happy number.

1491275988 is a `hidden beast` number, since 1 + 49 + 1 + 2 + 7 + 598 + 8 = 666.

It is a super-2 number, since 2×1491275988² = 4447808144770752288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491275983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104881 + ... + 118247.

It is an arithmetic number, because the mean of its divisors is an integer number (80631320).

Almost surely, 2^1491275988 is an apocalyptic number.

1491275988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1491275988 is an abundant number, since it is smaller than the sum of its proper divisors (2379027372).

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

1491275988 is a wasteful number, since it uses less digits than its factorization.

1491275988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14413 (or 14405 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The square root of 1491275988 is about 38617.0427143250. The cubic root of 1491275988 is about 1142.4907038620.

The spelling of 1491275988 in words is "one billion, four hundred ninety-one million, two hundred seventy-five thousand, nine hundred eighty-eight".