1220737901 has 4 divisors (see below), whose sum is σ = 1237460412. Its totient is φ = 1204015392.

The previous prime is 1220737877. The next prime is 1220737927. The reversal of 1220737901 is 1097370221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1097370221 = 3203 ⋅342607.

It can be written as a sum of positive squares in 2 ways, for example, as 260047876 + 960690025 = 16126^2 + 30995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220737901 - 2¹⁰ = 1220736877 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 (1220737951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8361146 + ... + 8361291.

It is an arithmetic number, because the mean of its divisors is an integer number (309365103).

Almost surely, 2^1220737901 is an apocalyptic number.

It is an amenable number.

1220737901 is a deficient number, since it is larger than the sum of its proper divisors (16722511).

1220737901 is an equidigital number, since it uses as much as digits as its factorization.

1220737901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16722510.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 1220737901 is about 34939.0598184897. The cubic root of 1220737901 is about 1068.7451154616.

The spelling of 1220737901 in words is "one billion, two hundred twenty million, seven hundred thirty-seven thousand, nine hundred one".