1531479220 has 12 divisors (see below), whose sum is σ = 3216106404. Its totient is φ = 612591680.

The previous prime is 1531479197. The next prime is 1531479223. The reversal of 1531479220 is 229741351.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 639381796 + 892097424 = 25286^2 + 29868^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531479223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38286961 + ... + 38287000.

It is an arithmetic number, because the mean of its divisors is an integer number (268008867).

Almost surely, 2^1531479220 is an apocalyptic number.

1531479220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1531479220 is an abundant number, since it is smaller than the sum of its proper divisors (1684627184).

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

1531479220 is a wasteful number, since it uses less digits than its factorization.

1531479220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76573970 (or 76573968 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 1531479220 is about 39134.1183623702. The cubic root of 1531479220 is about 1152.6665832992. Note that the first 3 decimals are identical.

The spelling of 1531479220 in words is "one billion, five hundred thirty-one million, four hundred seventy-nine thousand, two hundred twenty".