1222455551 has 2 divisors, whose sum is σ = 1222455552. Its totient is φ = 1222455550.

The previous prime is 1222455523. The next prime is 1222455593. The reversal of 1222455551 is 1555542221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222455551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222455511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611227775 + 611227776.

It is an arithmetic number, because the mean of its divisors is an integer number (611227776).

Almost surely, 2^1222455551 is an apocalyptic number.

1222455551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222455551 is an equidigital number, since it uses as much as digits as its factorization.

1222455551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20000, while the sum is 32.

The square root of 1222455551 is about 34963.6318336640. The cubic root of 1222455551 is about 1069.2461429481.

Adding to 1222455551 its reverse (1555542221), we get a palindrome (2777997772).

The spelling of 1222455551 in words is "one billion, two hundred twenty-two million, four hundred fifty-five thousand, five hundred fifty-one".