1288631413 has 4 divisors (see below), whose sum is σ = 1289030080. Its totient is φ = 1288232748.

The previous prime is 1288631401. The next prime is 1288631447. The reversal of 1288631413 is 3141368821.

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: 3141368821 = 50021 ⋅62801.

It is a cyclic number.

It is not a de Polignac number, because 1288631413 - 2¹⁷ = 1288500341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288631713) 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, 194445 + ... + 200962.

It is an arithmetic number, because the mean of its divisors is an integer number (322257520).

Almost surely, 2^1288631413 is an apocalyptic number.

It is an amenable number.

1288631413 is a deficient number, since it is larger than the sum of its proper divisors (398667).

1288631413 is an equidigital number, since it uses as much as digits as its factorization.

1288631413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398666.

The product of its digits is 27648, while the sum is 37.

The square root of 1288631413 is about 35897.5126297074. The cubic root of 1288631413 is about 1088.2021291870.

The spelling of 1288631413 in words is "one billion, two hundred eighty-eight million, six hundred thirty-one thousand, four hundred thirteen".