1225618811 has 2 divisors, whose sum is σ = 1225618812. Its totient is φ = 1225618810.

The previous prime is 1225618789. The next prime is 1225618813. The reversal of 1225618811 is 1188165221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1225618811 - 2²² = 1221424507 is a prime.

Together with 1225618813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1225618813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612809405 + 612809406.

It is an arithmetic number, because the mean of its divisors is an integer number (612809406).

Almost surely, 2^1225618811 is an apocalyptic number.

1225618811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225618811 is an equidigital number, since it uses as much as digits as its factorization.

1225618811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 35.

The square root of 1225618811 is about 35008.8390410193. The cubic root of 1225618811 is about 1070.1676189498.

The spelling of 1225618811 in words is "one billion, two hundred twenty-five million, six hundred eighteen thousand, eight hundred eleven".