1220873491 has 2 divisors, whose sum is σ = 1220873492. Its totient is φ = 1220873490.

The previous prime is 1220873483. The next prime is 1220873539. The reversal of 1220873491 is 1943780221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220873491 - 2³ = 1220873483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220873491.

It is not a weakly prime, because it can be changed into another prime (1220873461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610436745 + 610436746.

It is an arithmetic number, because the mean of its divisors is an integer number (610436746).

Almost surely, 2^1220873491 is an apocalyptic number.

1220873491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220873491 is an equidigital number, since it uses as much as digits as its factorization.

1220873491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1220873491 is about 34941.0001430984. Note that the first 3 decimals coincide. The cubic root of 1220873491 is about 1068.7846832742.

The spelling of 1220873491 in words is "one billion, two hundred twenty million, eight hundred seventy-three thousand, four hundred ninety-one".