1631445216 has 48 divisors (see below), whose sum is σ = 4292870400. Its totient is φ = 542503808.

The previous prime is 1631445191. The next prime is 1631445217. The reversal of 1631445216 is 6125441361.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1631445216² = 5323226985618573312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631445217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19945 + ... + 60503.

It is an arithmetic number, because the mean of its divisors is an integer number (89434800).

Almost surely, 2^1631445216 is an apocalyptic number.

1631445216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1631445216 is an abundant number, since it is smaller than the sum of its proper divisors (2661425184).

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

1631445216 is a wasteful number, since it uses less digits than its factorization.

1631445216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40991 (or 40983 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 1631445216 is about 40391.1526946187. The cubic root of 1631445216 is about 1177.2196379948.

Adding to 1631445216 its reverse (6125441361), we get a palindrome (7756886577).

The spelling of 1631445216 in words is "one billion, six hundred thirty-one million, four hundred forty-five thousand, two hundred sixteen".