1320688551 has 16 divisors (see below), whose sum is σ = 2167284224. Its totient is φ = 696626784.

The previous prime is 1320688549. The next prime is 1320688561. The reversal of 1320688551 is 1558860231.

It is not a de Polignac number, because 1320688551 - 2¹ = 1320688549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320688511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2418571 + ... + 2419116.

It is an arithmetic number, because the mean of its divisors is an integer number (135455264).

Almost surely, 2^1320688551 is an apocalyptic number.

1320688551 is a deficient number, since it is larger than the sum of its proper divisors (846595673).

1320688551 is a wasteful number, since it uses less digits than its factorization.

1320688551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4837710.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 1320688551 is about 36341.2788850365. The cubic root of 1320688551 is about 1097.1520131416.

The spelling of 1320688551 in words is "one billion, three hundred twenty million, six hundred eighty-eight thousand, five hundred fifty-one".