1491355847129 has 4 divisors (see below), whose sum is σ = 1579082661684. Its totient is φ = 1403629032576.

The previous prime is 1491355847077. The next prime is 1491355847131. The reversal of 1491355847129 is 9217485531941.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 608949243904 + 882406603225 = 780352^2 + 939365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491355847129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1491355847029) 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, 43863407252 + ... + 43863407285.

It is an arithmetic number, because the mean of its divisors is an integer number (394770665421).

Almost surely, 2^{1491355847129} is an apocalyptic number.

It is an amenable number.

1491355847129 is a deficient number, since it is larger than the sum of its proper divisors (87726814555).

1491355847129 is an equidigital number, since it uses as much as digits as its factorization.

1491355847129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87726814554.

The product of its digits is 10886400, while the sum is 59.

The spelling of 1491355847129 in words is "one trillion, four hundred ninety-one billion, three hundred fifty-five million, eight hundred forty-seven thousand, one hundred twenty-nine".