1213315723 has 2 divisors, whose sum is σ = 1213315724. Its totient is φ = 1213315722.

The previous prime is 1213315667. The next prime is 1213315751. The reversal of 1213315723 is 3275133121.

It is an a-pointer prime, because the next prime (1213315751) can be obtained adding 1213315723 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213315723 - 2¹³ = 1213307531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213315691 and 1213315700.

It is not a weakly prime, because it can be changed into another prime (1213315793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606657861 + 606657862.

It is an arithmetic number, because the mean of its divisors is an integer number (606657862).

Almost surely, 2^1213315723 is an apocalyptic number.

1213315723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213315723 is an equidigital number, since it uses as much as digits as its factorization.

1213315723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 28.

The square root of 1213315723 is about 34832.6818232533. The cubic root of 1213315723 is about 1066.5746939037.

Adding to 1213315723 its reverse (3275133121), we get a palindrome (4488448844).

The spelling of 1213315723 in words is "one billion, two hundred thirteen million, three hundred fifteen thousand, seven hundred twenty-three".