1213250513 has 2 divisors, whose sum is σ = 1213250514. Its totient is φ = 1213250512.

The previous prime is 1213250501. The next prime is 1213250537. The reversal of 1213250513 is 3150523121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 771283984 + 441966529 = 27772^2 + 21023^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213250513 - 2⁶ = 1213250449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1213250593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606625256 + 606625257.

It is an arithmetic number, because the mean of its divisors is an integer number (606625257).

Almost surely, 2^1213250513 is an apocalyptic number.

It is an amenable number.

1213250513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213250513 is an equidigital number, since it uses as much as digits as its factorization.

1213250513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1213250513 is about 34831.7457644603. The cubic root of 1213250513 is about 1066.5555857742. Note that the first 4 decimals are identical.

Adding to 1213250513 its reverse (3150523121), we get a palindrome (4363773634).

The spelling of 1213250513 in words is "one billion, two hundred thirteen million, two hundred fifty thousand, five hundred thirteen".