1491736129 has 9 divisors (see below), whose sum is σ = 1615855779. Its totient is φ = 1376523720.

The previous prime is 1491736123. The next prime is 1491736153. The reversal of 1491736129 is 9216371941.

The square root of 1491736129 is 38623.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 220671025 + 1271065104 = 14855^2 + 35652^2 .

It is not a de Polignac number, because 1491736129 - 2⁹ = 1491735617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1491736123) 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 8 ways as a sum of consecutive naturals, for example, 500614 + ... + 503584.

It is an arithmetic number, because the mean of its divisors is an integer number (179539531).

Almost surely, 2^1491736129 is an apocalyptic number.

1491736129 is the 38623-rd square number.

1491736129 is the 19312-nd centered octagonal number.

It is an amenable number.

1491736129 is a deficient number, since it is larger than the sum of its proper divisors (124119650).

1491736129 is an frugal number, since it uses more digits than its factorization.

1491736129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5968 (or 2984 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The cubic root of 1491736129 is about 1142.6081989375.

The spelling of 1491736129 in words is "one billion, four hundred ninety-one million, seven hundred thirty-six thousand, one hundred twenty-nine".