1220956337 has 4 divisors (see below), whose sum is σ = 1292777316. Its totient is φ = 1149135360.

The previous prime is 1220956333. The next prime is 1220956339. The reversal of 1220956337 is 7336590221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7336590221 = 3559 ⋅2061419.

It can be written as a sum of positive squares in 2 ways, for example, as 475065616 + 745890721 = 21796^2 + 27311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220956337 - 2² = 1220956333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220956337.

It is not an unprimeable number, because it can be changed into a prime (1220956333) 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, 35910464 + ... + 35910497.

It is an arithmetic number, because the mean of its divisors is an integer number (323194329).

Almost surely, 2^1220956337 is an apocalyptic number.

1220956337 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1220956337 is a deficient number, since it is larger than the sum of its proper divisors (71820979).

1220956337 is an equidigital number, since it uses as much as digits as its factorization.

1220956337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71820978.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 1220956337 is about 34942.1856357040. The cubic root of 1220956337 is about 1068.8088579147.

The spelling of 1220956337 in words is "one billion, two hundred twenty million, nine hundred fifty-six thousand, three hundred thirty-seven".