1361221273 has 8 divisors (see below), whose sum is σ = 1398569760. Its totient is φ = 1324348800.

The previous prime is 1361221249. The next prime is 1361221319. The reversal of 1361221273 is 3721221631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1361221273 - 2⁹ = 1361220761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1361221223) 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 7 ways as a sum of consecutive naturals, for example, 113203 + ... + 124648.

It is an arithmetic number, because the mean of its divisors is an integer number (174821220).

Almost surely, 2^1361221273 is an apocalyptic number.

It is an amenable number.

1361221273 is a deficient number, since it is larger than the sum of its proper divisors (37348487).

1361221273 is an equidigital number, since it uses as much as digits as its factorization.

1361221273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238007.

The product of its digits is 3024, while the sum is 28.

The square root of 1361221273 is about 36894.7323204817. The cubic root of 1361221273 is about 1108.2631911038.

The spelling of 1361221273 in words is "one billion, three hundred sixty-one million, two hundred twenty-one thousand, two hundred seventy-three".