1220120497 has 4 divisors (see below), whose sum is σ = 1220192100. Its totient is φ = 1220048896.

The previous prime is 1220120479. The next prime is 1220120513. The reversal of 1220120497 is 7940210221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7940210221 = 47 ⋅168940643.

It can be written as a sum of positive squares in 2 ways, for example, as 997991281 + 222129216 = 31591^2 + 14904^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220120497 - 2²³ = 1211731889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220120437) 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, 6129 + ... + 49777.

It is an arithmetic number, because the mean of its divisors is an integer number (305048025).

Almost surely, 2^1220120497 is an apocalyptic number.

It is an amenable number.

1220120497 is a deficient number, since it is larger than the sum of its proper divisors (71603).

1220120497 is an equidigital number, since it uses as much as digits as its factorization.

1220120497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71602.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1220120497 is about 34930.2232600938. The cubic root of 1220120497 is about 1068.5649078506.

The spelling of 1220120497 in words is "one billion, two hundred twenty million, one hundred twenty thousand, four hundred ninety-seven".