1491128413 has 4 divisors (see below), whose sum is σ = 1502012700. Its totient is φ = 1480244128.

The previous prime is 1491128411. The next prime is 1491128461. The reversal of 1491128413 is 3148211941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3148211941 = 7 ⋅449744563.

It can be written as a sum of positive squares in 2 ways, for example, as 1011430809 + 479697604 = 31803^2 + 21902^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491128413 - 2¹ = 1491128411 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491128411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5441938 + ... + 5442211.

It is an arithmetic number, because the mean of its divisors is an integer number (375503175).

Almost surely, 2^1491128413 is an apocalyptic number.

It is an amenable number.

1491128413 is a deficient number, since it is larger than the sum of its proper divisors (10884287).

1491128413 is a wasteful number, since it uses less digits than its factorization.

1491128413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10884286.

The product of its digits is 6912, while the sum is 34.

The square root of 1491128413 is about 38615.1319174233. The cubic root of 1491128413 is about 1142.4530160857.

The spelling of 1491128413 in words is "one billion, four hundred ninety-one million, one hundred twenty-eight thousand, four hundred thirteen".