1220661126 has 24 divisors (see below), whose sum is σ = 2694669120. Its totient is φ = 399209616.

The previous prime is 1220661121. The next prime is 1220661133. The reversal of 1220661126 is 6211660221.

1220661126 is a `hidden beast` number, since 1 + 2 + 20 + 6 + 611 + 26 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1220661126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220661121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 638806 + ... + 640713.

It is an arithmetic number, because the mean of its divisors is an integer number (112277880).

Almost surely, 2^1220661126 is an apocalyptic number.

1220661126 is an abundant number, since it is smaller than the sum of its proper divisors (1474007994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220661126 is a wasteful number, since it uses less digits than its factorization.

1220661126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279580 (or 1279577 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1220661126 is about 34937.9611025028. The cubic root of 1220661126 is about 1068.7227097166.

The spelling of 1220661126 in words is "one billion, two hundred twenty million, six hundred sixty-one thousand, one hundred twenty-six".