1220097961 has 4 divisors (see below), whose sum is σ = 1220203732. Its totient is φ = 1219992192.

The previous prime is 1220097959. The next prime is 1220098003. The reversal of 1220097961 is 1697900221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1025216361 + 194881600 = 32019^2 + 13960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220097961 - 2¹ = 1220097959 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 1220097961.

It is not an unprimeable number, because it can be changed into a prime (1220097911) 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, 33120 + ... + 59473.

It is an arithmetic number, because the mean of its divisors is an integer number (305050933).

Almost surely, 2^1220097961 is an apocalyptic number.

It is an amenable number.

1220097961 is a deficient number, since it is larger than the sum of its proper divisors (105771).

1220097961 is an equidigital number, since it uses as much as digits as its factorization.

1220097961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105770.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1220097961 is about 34929.9006726329. The cubic root of 1220097961 is about 1068.5583289028.

The spelling of 1220097961 in words is "one billion, two hundred twenty million, ninety-seven thousand, nine hundred sixty-one".