1221480777 has 8 divisors (see below), whose sum is σ = 1776699360. Its totient is φ = 740291360.

The previous prime is 1221480773. The next prime is 1221480781. The reversal of 1221480777 is 7770841221.

It is an interprime number because it is at equal distance from previous prime (1221480773) and next prime (1221480781).

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

It is a cyclic number.

It is not a de Polignac number, because 1221480777 - 2² = 1221480773 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221480773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18507252 + ... + 18507317.

It is an arithmetic number, because the mean of its divisors is an integer number (222087420).

Almost surely, 2^1221480777 is an apocalyptic number.

It is an amenable number.

1221480777 is a deficient number, since it is larger than the sum of its proper divisors (555218583).

1221480777 is a wasteful number, since it uses less digits than its factorization.

1221480777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37014583.

The product of its (nonzero) digits is 43904, while the sum is 39.

The square root of 1221480777 is about 34949.6892260861. The cubic root of 1221480777 is about 1068.9618652650.

The spelling of 1221480777 in words is "one billion, two hundred twenty-one million, four hundred eighty thousand, seven hundred seventy-seven".