1631128512 has 168 divisors, whose sum is σ = 4949775216. Its totient is φ = 472203264.

The previous prime is 1631128501. The next prime is 1631128523. The reversal of 1631128512 is 2158211361.

It is an interprime number because it is at equal distance from previous prime (1631128501) and next prime (1631128523).

It is a self number, because there is not a number n which added to its sum of digits gives 1631128512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 550138 + ... + 553094.

Almost surely, 2^1631128512 is an apocalyptic number.

1631128512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1631128512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2474887608).

1631128512 is an abundant number, since it is smaller than the sum of its proper divisors (3318646704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1631128512 is a wasteful number, since it uses less digits than its factorization.

1631128512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015 (or 2992 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 1631128512 is about 40387.2320418223. The cubic root of 1631128512 is about 1177.1434572171.

Adding to 1631128512 its reverse (2158211361), we get a palindrome (3789339873).

The spelling of 1631128512 in words is "one billion, six hundred thirty-one million, one hundred twenty-eight thousand, five hundred twelve".