31521330152 has 16 divisors (see below), whose sum is σ = 63648839940. Its totient is φ = 14548306176.

The previous prime is 31521330083. The next prime is 31521330157. The reversal of 31521330152 is 25103312513.

It can be written as a sum of positive squares in 2 ways, for example, as 22966190116 + 8555140036 = 151546^2 + 92494^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (31521330157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151544753 + ... + 151544960.

Almost surely, 2^31521330152 is an apocalyptic number.

It is an amenable number.

31521330152 is an abundant number, since it is smaller than the sum of its proper divisors (32127509788).

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

31521330152 is a wasteful number, since it uses less digits than its factorization.

31521330152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303089732 (or 303089728 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 31521330152 its reverse (25103312513), we get a palindrome (56624642665).

The spelling of 31521330152 in words is "thirty-one billion, five hundred twenty-one million, three hundred thirty thousand, one hundred fifty-two".