1220403251 has 2 divisors, whose sum is σ = 1220403252. Its totient is φ = 1220403250.

The previous prime is 1220403211. The next prime is 1220403263. The reversal of 1220403251 is 1523040221.

It is a strong prime.

It is an emirp because it is prime and its reverse (1523040221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220403251 - 2⁶ = 1220403187 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220403211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610201625 + 610201626.

It is an arithmetic number, because the mean of its divisors is an integer number (610201626).

Almost surely, 2^1220403251 is an apocalyptic number.

1220403251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220403251 is an equidigital number, since it uses as much as digits as its factorization.

1220403251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1220403251 is about 34934.2704374945. The cubic root of 1220403251 is about 1068.6474455087.

Adding to 1220403251 its reverse (1523040221), we get a palindrome (2743443472).

The spelling of 1220403251 in words is "one billion, two hundred twenty million, four hundred three thousand, two hundred fifty-one".