1228312513 has 4 divisors (see below), whose sum is σ = 1292960560. Its totient is φ = 1163664468.

The previous prime is 1228312511. The next prime is 1228312639. The reversal of 1228312513 is 3152138221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3152138221 = 2861 ⋅1101761.

It is a cyclic number.

It is not a de Polignac number, because 1228312513 - 2¹ = 1228312511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228312511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32323995 + ... + 32324032.

It is an arithmetic number, because the mean of its divisors is an integer number (323240140).

Almost surely, 2^1228312513 is an apocalyptic number.

It is an amenable number.

1228312513 is a deficient number, since it is larger than the sum of its proper divisors (64648047).

1228312513 is an equidigital number, since it uses as much as digits as its factorization.

1228312513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64648046.

The product of its digits is 2880, while the sum is 28.

The square root of 1228312513 is about 35047.2896669628. The cubic root of 1228312513 is about 1070.9510608324.

The spelling of 1228312513 in words is "one billion, two hundred twenty-eight million, three hundred twelve thousand, five hundred thirteen".