1328955551 has 16 divisors (see below), whose sum is σ = 1744085760. Its totient is φ = 981046080.

The previous prime is 1328955527. The next prime is 1328955553. The reversal of 1328955551 is 1555598231.

It is not a de Polignac number, because 1328955551 - 2¹⁴ = 1328939167 is a prime.

It is a super-2 number, since 2×1328955551² = 3532245713067427202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328955553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452726 + ... + 455651.

It is an arithmetic number, because the mean of its divisors is an integer number (109005360).

Almost surely, 2^1328955551 is an apocalyptic number.

1328955551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1328955551 is a deficient number, since it is larger than the sum of its proper divisors (415130209).

1328955551 is a wasteful number, since it uses less digits than its factorization.

1328955551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908414.

The product of its digits is 270000, while the sum is 44.

The square root of 1328955551 is about 36454.8426275577. The cubic root of 1328955551 is about 1099.4365022951.

The spelling of 1328955551 in words is "one billion, three hundred twenty-eight million, nine hundred fifty-five thousand, five hundred fifty-one".