1492191731809 has 27 divisors (see below), whose sum is σ = 1574086502163. Its totient is φ = 1414441104912.

The previous prime is 1492191731683. The next prime is 1492191731851. The reversal of 1492191731809 is 9081371912941.

The square root of 1492191731809 is 1221553.

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., 1357376454225 + 134815277584 = 1165065^2 + 367172^2 .

It is not a de Polignac number, because 1492191731809 - 2⁹ = 1492191731297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1492191731809.

It is not an unprimeable number, because it can be changed into a prime (1492191731869) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4860559234 + ... + 4860559540.

Almost surely, 2^{1492191731809} is an apocalyptic number.

1492191731809 is the 1221553-rd square number.

1492191731809 is the 610777-th centered octagonal number.

It is an amenable number.

1492191731809 is a deficient number, since it is larger than the sum of its proper divisors (81894770354).

1492191731809 is an frugal number, since it uses more digits than its factorization.

1492191731809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 55.

The spelling of 1492191731809 in words is "one trillion, four hundred ninety-two billion, one hundred ninety-one million, seven hundred thirty-one thousand, eight hundred nine".