1653421597 has 4 divisors (see below), whose sum is σ = 1658637756. Its totient is φ = 1648205440.

The previous prime is 1653421589. The next prime is 1653421613. The reversal of 1653421597 is 7951243561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7951243561 = 283 ⋅28096267.

It can be written as a sum of positive squares in 2 ways, for example, as 785176441 + 868245156 = 28021^2 + 29466^2 .

It is a cyclic number.

It is not a de Polignac number, because 1653421597 - 2³ = 1653421589 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 (1653421577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2607604 + ... + 2608237.

It is an arithmetic number, because the mean of its divisors is an integer number (414659439).

Almost surely, 2^1653421597 is an apocalyptic number.

It is an amenable number.

1653421597 is a deficient number, since it is larger than the sum of its proper divisors (5216159).

1653421597 is an equidigital number, since it uses as much as digits as its factorization.

1653421597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5216158.

The product of its digits is 226800, while the sum is 43.

The square root of 1653421597 is about 40662.2871589880. The cubic root of 1653421597 is about 1182.4819913615.

The spelling of 1653421597 in words is "one billion, six hundred fifty-three million, four hundred twenty-one thousand, five hundred ninety-seven".