1631045320 has 64 divisors (see below), whose sum is σ = 3795232320. Its totient is φ = 630499584.

The previous prime is 1631045309. The next prime is 1631045323. The reversal of 1631045320 is 235401361.

It is not an unprimeable number, because it can be changed into a prime (1631045323) 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, 136299 + ... + 147781.

It is an arithmetic number, because the mean of its divisors is an integer number (59300505).

Almost surely, 2^1631045320 is an apocalyptic number.

1631045320 is a gapful number since it is divisible by the number (10) 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 1631045320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1897616160).

1631045320 is an abundant number, since it is smaller than the sum of its proper divisors (2164187000).

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

1631045320 is a wasteful number, since it uses less digits than its factorization.

1631045320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11614 (or 11610 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1631045320 is about 40386.2020992319. The cubic root of 1631045320 is about 1177.1234443686.

Adding to 1631045320 its reverse (235401361), we get a palindrome (1866446681).

The spelling of 1631045320 in words is "one billion, six hundred thirty-one million, forty-five thousand, three hundred twenty".