1671531220 has 12 divisors (see below), whose sum is σ = 3510215604. Its totient is φ = 668612480.

The previous prime is 1671531181. The next prime is 1671531283. The reversal of 1671531220 is 221351761.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 409576644 + 1261954576 = 20238^2 + 35524^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41788261 + ... + 41788300.

It is an arithmetic number, because the mean of its divisors is an integer number (292517967).

Almost surely, 2^1671531220 is an apocalyptic number.

1671531220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1671531220 is an abundant number, since it is smaller than the sum of its proper divisors (1838684384).

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

1671531220 is a wasteful number, since it uses less digits than its factorization.

1671531220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83576570 (or 83576568 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1671531220 is about 40884.3640038585. The cubic root of 1671531220 is about 1186.7834941931.

Adding to 1671531220 its reverse (221351761), we get a palindrome (1892882981).

The spelling of 1671531220 in words is "one billion, six hundred seventy-one million, five hundred thirty-one thousand, two hundred twenty".