1654209997 has 12 divisors (see below), whose sum is σ = 1819248480. Its totient is φ = 1503013160.

The previous prime is 1654209989. The next prime is 1654210009. The reversal of 1654209997 is 7999024561.

It is not a de Polignac number, because 1654209997 - 2³ = 1654209989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1654209917) 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 11 ways as a sum of consecutive naturals, for example, 426288 + ... + 430150.

It is an arithmetic number, because the mean of its divisors is an integer number (151604040).

Almost surely, 2^1654209997 is an apocalyptic number.

It is an amenable number.

1654209997 is a deficient number, since it is larger than the sum of its proper divisors (165038483).

1654209997 is a wasteful number, since it uses less digits than its factorization.

1654209997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7424 (or 7413 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 52.

The square root of 1654209997 is about 40671.9804902589. The cubic root of 1654209997 is about 1182.6699088826.

The spelling of 1654209997 in words is "one billion, six hundred fifty-four million, two hundred nine thousand, nine hundred ninety-seven".