1997291457 has 48 divisors (see below), whose sum is σ = 3621596160. Its totient is φ = 1034215776.

The previous prime is 1997291447. The next prime is 1997291459. The reversal of 1997291457 is 7541927991.

1997291457 is a `hidden beast` number, since 19 + 97 + 2 + 91 + 457 = 666.

It is not a de Polignac number, because 1997291457 - 2⁴ = 1997291441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1997291459) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 8743 + ... + 63804.

It is an arithmetic number, because the mean of its divisors is an integer number (75449920).

Almost surely, 2^1997291457 is an apocalyptic number.

It is an amenable number.

1997291457 is a deficient number, since it is larger than the sum of its proper divisors (1624304703).

1997291457 is a wasteful number, since it uses less digits than its factorization.

1997291457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72602 (or 72599 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 54.

The square root of 1997291457 is about 44691.0668590491. The cubic root of 1997291457 is about 1259.3520345604.

The spelling of 1997291457 in words is "one billion, nine hundred ninety-seven million, two hundred ninety-one thousand, four hundred fifty-seven".