1491658281992 has 12 divisors (see below), whose sum is σ = 2796865755855. Its totient is φ = 745827413768.

The previous prime is 1491658281973. The next prime is 1491658282021. The reversal of 1491658281992 is 2991828561941.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 745829140996 + 745829140996 = 863614^2 + 863614^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=863614.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3238553 + ... + 3670359.

Almost surely, 2^{1491658281992} is an apocalyptic number.

It is an amenable number.

1491658281992 is a deficient number, since it is larger than the sum of its proper divisors (1305207473863).

1491658281992 is an frugal number, since it uses more digits than its factorization.

1491658281992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863620 (or 431809 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 65.

The spelling of 1491658281992 in words is "one trillion, four hundred ninety-one billion, six hundred fifty-eight million, two hundred eighty-one thousand, nine hundred ninety-two".