1323778451 has 2 divisors, whose sum is σ = 1323778452. Its totient is φ = 1323778450.

The previous prime is 1323778411. The next prime is 1323778481. The reversal of 1323778451 is 1548773231.

It is a strong prime.

It is an emirp because it is prime and its reverse (1548773231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1323778451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1323778399 and 1323778408.

It is not a weakly prime, because it can be changed into another prime (1323778411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661889225 + 661889226.

It is an arithmetic number, because the mean of its divisors is an integer number (661889226).

Almost surely, 2^1323778451 is an apocalyptic number.

1323778451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323778451 is an equidigital number, since it uses as much as digits as its factorization.

1323778451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The square root of 1323778451 is about 36383.7663113647. The cubic root of 1323778451 is about 1098.0069837302.

The spelling of 1323778451 in words is "one billion, three hundred twenty-three million, seven hundred seventy-eight thousand, four hundred fifty-one".