1220180897 has 4 divisors (see below), whose sum is σ = 1314040980. Its totient is φ = 1126320816.

The previous prime is 1220180879. The next prime is 1220180903. The reversal of 1220180897 is 7980810221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 231770176 + 988410721 = 15224^2 + 31439^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220180897 - 2¹² = 1220176801 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 1220180897.

It is not an unprimeable number, because it can be changed into a prime (1220180837) 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, 46930022 + ... + 46930047.

It is an arithmetic number, because the mean of its divisors is an integer number (328510245).

Almost surely, 2^1220180897 is an apocalyptic number.

It is an amenable number.

1220180897 is a deficient number, since it is larger than the sum of its proper divisors (93860083).

1220180897 is an equidigital number, since it uses as much as digits as its factorization.

1220180897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93860082.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 1220180897 is about 34931.0878301836. The cubic root of 1220180897 is about 1068.5825400586.

The spelling of 1220180897 in words is "one billion, two hundred twenty million, one hundred eighty thousand, eight hundred ninety-seven".