1220650853 has 4 divisors (see below), whose sum is σ = 1222498188. Its totient is φ = 1218803520.

The previous prime is 1220650843. The next prime is 1220650903. The reversal of 1220650853 is 3580560221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3580560221 = 7 ⋅511508603.

It can be written as a sum of positive squares in 2 ways, for example, as 1087548484 + 133102369 = 32978^2 + 11537^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220650853 - 2⁸ = 1220650597 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 (1220650843) 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, 922676 + ... + 923997.

It is an arithmetic number, because the mean of its divisors is an integer number (305624547).

Almost surely, 2^1220650853 is an apocalyptic number.

It is an amenable number.

1220650853 is a deficient number, since it is larger than the sum of its proper divisors (1847335).

1220650853 is an equidigital number, since it uses as much as digits as its factorization.

1220650853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847334.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1220650853 is about 34937.8140844558. The cubic root of 1220650853 is about 1068.7197116093.

The spelling of 1220650853 in words is "one billion, two hundred twenty million, six hundred fifty thousand, eight hundred fifty-three".