1220661071 has 8 divisors (see below), whose sum is σ = 1398057984. Its totient is φ = 1044018360.

The previous prime is 1220661067. The next prime is 1220661103. The reversal of 1220661071 is 1701660221.

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

It is not a de Polignac number, because 1220661071 - 2² = 1220661067 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 1220661071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220661031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185075 + ... + 191556.

It is an arithmetic number, because the mean of its divisors is an integer number (174757248).

Almost surely, 2^1220661071 is an apocalyptic number.

1220661071 is a deficient number, since it is larger than the sum of its proper divisors (177396913).

1220661071 is an equidigital number, since it uses as much as digits as its factorization.

1220661071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377101.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 1220661071 is about 34937.9603153933. The cubic root of 1220661071 is about 1068.7226936653.

The spelling of 1220661071 in words is "one billion, two hundred twenty million, six hundred sixty-one thousand, seventy-one".