1221860413 has 2 divisors, whose sum is σ = 1221860414. Its totient is φ = 1221860412.

The previous prime is 1221860407. The next prime is 1221860447. The reversal of 1221860413 is 3140681221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1208118564 + 13741849 = 34758^2 + 3707^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221860413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221863413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610930206 + 610930207.

It is an arithmetic number, because the mean of its divisors is an integer number (610930207).

Almost surely, 2^1221860413 is an apocalyptic number.

It is an amenable number.

1221860413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221860413 is an equidigital number, since it uses as much as digits as its factorization.

1221860413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1221860413 is about 34955.1199826292. The cubic root of 1221860413 is about 1069.0725981773.

The spelling of 1221860413 in words is "one billion, two hundred twenty-one million, eight hundred sixty thousand, four hundred thirteen".