1221630759 has 12 divisors (see below), whose sum is σ = 1766737752. Its totient is φ = 813423600.

The previous prime is 1221630719. The next prime is 1221630797. The reversal of 1221630759 is 9570361221.

1221630759 is a `hidden beast` number, since 12 + 2 + 1 + 630 + 7 + 5 + 9 = 666.

It is not a de Polignac number, because 1221630759 - 2¹² = 1221626663 is a prime.

It is a super-2 number, since 2×1221630759² = 2984763422669832162, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221630719) 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, 75277 + ... + 90054.

It is an arithmetic number, because the mean of its divisors is an integer number (147228146).

Almost surely, 2^1221630759 is an apocalyptic number.

1221630759 is a deficient number, since it is larger than the sum of its proper divisors (545106993).

1221630759 is a wasteful number, since it uses less digits than its factorization.

1221630759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166158 (or 166155 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 1221630759 is about 34951.8348445400. The cubic root of 1221630759 is about 1069.0056150262.

The spelling of 1221630759 in words is "one billion, two hundred twenty-one million, six hundred thirty thousand, seven hundred fifty-nine".