1209651653 has 4 divisors (see below), whose sum is σ = 1382459040. Its totient is φ = 1036844268.

The previous prime is 1209651631. The next prime is 1209651661. The reversal of 1209651653 is 3561569021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1209651653 - 2¹² = 1209647557 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 (1209651623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86403683 + ... + 86403696.

It is an arithmetic number, because the mean of its divisors is an integer number (345614760).

Almost surely, 2^1209651653 is an apocalyptic number.

It is an amenable number.

1209651653 is a deficient number, since it is larger than the sum of its proper divisors (172807387).

1209651653 is an equidigital number, since it uses as much as digits as its factorization.

1209651653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172807386.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 1209651653 is about 34780.0467653510. The cubic root of 1209651653 is about 1065.4999681799.

The spelling of 1209651653 in words is "one billion, two hundred nine million, six hundred fifty-one thousand, six hundred fifty-three".