1220909953 has 4 divisors (see below), whose sum is σ = 1222948800. Its totient is φ = 1218871108.

The previous prime is 1220909939. The next prime is 1220909957. The reversal of 1220909953 is 3599090221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3599090221 = 227 ⋅15855023.

It is a cyclic number.

It is not a de Polignac number, because 1220909953 - 2¹³ = 1220901761 is a prime.

It is a super-2 number, since 2×1220909953² = 2981242226668924418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220909957) 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, 1018525 + ... + 1019722.

It is an arithmetic number, because the mean of its divisors is an integer number (305737200).

Almost surely, 2^1220909953 is an apocalyptic number.

It is an amenable number.

1220909953 is a deficient number, since it is larger than the sum of its proper divisors (2038847).

1220909953 is an equidigital number, since it uses as much as digits as its factorization.

1220909953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038846.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 1220909953 is about 34941.5219044620. The cubic root of 1220909953 is about 1068.7953230987.

The spelling of 1220909953 in words is "one billion, two hundred twenty million, nine hundred nine thousand, nine hundred fifty-three".