1653436493 has 4 divisors (see below), whose sum is σ = 1654210908. Its totient is φ = 1652662080.

The previous prime is 1653436481. The next prime is 1653436513. The reversal of 1653436493 is 3946343561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 833015044 + 820421449 = 28862^2 + 28643^2 .

It is a cyclic number.

It is not a de Polignac number, because 1653436493 - 2¹² = 1653432397 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 (1653436193) 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, 383996 + ... + 388277.

It is an arithmetic number, because the mean of its divisors is an integer number (413552727).

Almost surely, 2^1653436493 is an apocalyptic number.

It is an amenable number.

1653436493 is a deficient number, since it is larger than the sum of its proper divisors (774415).

1653436493 is an equidigital number, since it uses as much as digits as its factorization.

1653436493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774414.

The product of its digits is 699840, while the sum is 44.

The square root of 1653436493 is about 40662.4703258422. The cubic root of 1653436493 is about 1182.4855424216.

The spelling of 1653436493 in words is "one billion, six hundred fifty-three million, four hundred thirty-six thousand, four hundred ninety-three".