1491624491 has 16 divisors (see below), whose sum is σ = 1716194304. Its totient is φ = 1269953664.

The previous prime is 1491624481. The next prime is 1491624499. The reversal of 1491624491 is 1944261941.

It is not a de Polignac number, because 1491624491 - 2³⁰ = 417882667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1491624499) 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, 941486 + ... + 943068.

It is an arithmetic number, because the mean of its divisors is an integer number (107262144).

Almost surely, 2^1491624491 is an apocalyptic number.

1491624491 is a deficient number, since it is larger than the sum of its proper divisors (224569813).

1491624491 is a wasteful number, since it uses less digits than its factorization.

1491624491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2410.

The product of its digits is 62208, while the sum is 41.

The square root of 1491624491 is about 38621.5547460223. The cubic root of 1491624491 is about 1142.5796948623.

The spelling of 1491624491 in words is "one billion, four hundred ninety-one million, six hundred twenty-four thousand, four hundred ninety-one".