1212223477 has 2 divisors, whose sum is σ = 1212223478. Its totient is φ = 1212223476.

The previous prime is 1212223457. The next prime is 1212223559. The reversal of 1212223477 is 7743222121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 801512721 + 410710756 = 28311^2 + 20266^2 .

It is an emirp because it is prime and its reverse (7743222121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212223477 - 2¹⁹ = 1211699189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212223447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606111738 + 606111739.

It is an arithmetic number, because the mean of its divisors is an integer number (606111739).

Almost surely, 2^1212223477 is an apocalyptic number.

It is an amenable number.

1212223477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212223477 is an equidigital number, since it uses as much as digits as its factorization.

1212223477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 31.

The square root of 1212223477 is about 34816.9998276704. Note that the first 3 decimals coincide. The cubic root of 1212223477 is about 1066.2545486828.

Adding to 1212223477 its reverse (7743222121), we get a palindrome (8955445598).

The spelling of 1212223477 in words is "one billion, two hundred twelve million, two hundred twenty-three thousand, four hundred seventy-seven".