1220464251 has 24 divisors (see below), whose sum is σ = 1782917136. Its totient is φ = 804448320.

The previous prime is 1220464237. The next prime is 1220464279. The reversal of 1220464251 is 1524640221.

1220464251 is a `hidden beast` number, since 12 + 2 + 0 + 4 + 642 + 5 + 1 = 666.

It is not a de Polignac number, because 1220464251 - 2¹¹ = 1220462203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220465251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 343681 + ... + 347213.

It is an arithmetic number, because the mean of its divisors is an integer number (74288214).

Almost surely, 2^1220464251 is an apocalyptic number.

1220464251 is a deficient number, since it is larger than the sum of its proper divisors (562452885).

1220464251 is a wasteful number, since it uses less digits than its factorization.

1220464251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3963 (or 3960 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 1220464251 is about 34935.1434947676. The cubic root of 1220464251 is about 1068.6652501177.

The spelling of 1220464251 in words is "one billion, two hundred twenty million, four hundred sixty-four thousand, two hundred fifty-one".