1220777413 has 4 divisors (see below), whose sum is σ = 1228970700. Its totient is φ = 1212584128.

The previous prime is 1220777399. The next prime is 1220777447. The reversal of 1220777413 is 3147770221.

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 135536164 + 1085241249 = 11642^2 + 32943^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220777413 - 2⁹ = 1220776901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220777473) 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, 4096420 + ... + 4096717.

It is an arithmetic number, because the mean of its divisors is an integer number (307242675).

Almost surely, 2^1220777413 is an apocalyptic number.

It is an amenable number.

1220777413 is a deficient number, since it is larger than the sum of its proper divisors (8193287).

1220777413 is an equidigital number, since it uses as much as digits as its factorization.

1220777413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8193286.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 1220777413 is about 34939.6252555748. The cubic root of 1220777413 is about 1068.7566461381.

The spelling of 1220777413 in words is "one billion, two hundred twenty million, seven hundred seventy-seven thousand, four hundred thirteen".