1491490491 has 16 divisors (see below), whose sum is σ = 2012128800. Its totient is φ = 982637568.

The previous prime is 1491490489. The next prime is 1491490493. The reversal of 1491490491 is 1940941941.

It is an interprime number because it is at equal distance from previous prime (1491490489) and next prime (1491490493).

It is not a de Polignac number, because 1491490491 - 2¹ = 1491490489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1491490493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124075 + ... + 135563.

It is an arithmetic number, because the mean of its divisors is an integer number (125758050).

Almost surely, 2^1491490491 is an apocalyptic number.

1491490491 is a deficient number, since it is larger than the sum of its proper divisors (520638309).

1491490491 is a wasteful number, since it uses less digits than its factorization.

1491490491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11998.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 1491490491 is about 38619.8199244895. The cubic root of 1491490491 is about 1142.5454793107.

The spelling of 1491490491 in words is "one billion, four hundred ninety-one million, four hundred ninety thousand, four hundred ninety-one".