1220430251 has 2 divisors, whose sum is σ = 1220430252. Its totient is φ = 1220430250.

The previous prime is 1220430199. The next prime is 1220430269. The reversal of 1220430251 is 1520340221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220430251 - 2¹⁸ = 1220168107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220430451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610215125 + 610215126.

It is an arithmetic number, because the mean of its divisors is an integer number (610215126).

Almost surely, 2^1220430251 is an apocalyptic number.

1220430251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220430251 is an equidigital number, since it uses as much as digits as its factorization.

1220430251 is an evil number, because the sum of its binary digits is even.

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

The square root of 1220430251 is about 34934.6568753723. The cubic root of 1220430251 is about 1068.6553263104.

Adding to 1220430251 its reverse (1520340221), we get a palindrome (2740770472).

The spelling of 1220430251 in words is "one billion, two hundred twenty million, four hundred thirty thousand, two hundred fifty-one".