1245120653 has 4 divisors (see below), whose sum is σ = 1422995040. Its totient is φ = 1067246268.

The previous prime is 1245120649. The next prime is 1245120661. The reversal of 1245120653 is 3560215421.

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 1245120653 - 2² = 1245120649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245120353) 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, 88937183 + ... + 88937196.

It is an arithmetic number, because the mean of its divisors is an integer number (355748760).

Almost surely, 2^1245120653 is an apocalyptic number.

It is an amenable number.

1245120653 is a deficient number, since it is larger than the sum of its proper divisors (177874387).

1245120653 is an equidigital number, since it uses as much as digits as its factorization.

1245120653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177874386.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1245120653 is about 35286.2672012782. The cubic root of 1245120653 is about 1075.8138860464.

The spelling of 1245120653 in words is "one billion, two hundred forty-five million, one hundred twenty thousand, six hundred fifty-three".