31428500513 has 24 divisors (see below), whose sum is σ = 33441362136. Its totient is φ = 29517824000.

The previous prime is 31428500483. The next prime is 31428500531. The reversal of 31428500513 is 31500582413.

It can be written as a sum of positive squares in 12 ways, for example, as 218684944 + 31209815569 = 14788^2 + 176663^2 .

It is not a de Polignac number, because 31428500513 - 2¹² = 31428496417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31428500513.

It is not an unprimeable number, because it can be changed into a prime (31428500413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13825745 + ... + 13828017.

It is an arithmetic number, because the mean of its divisors is an integer number (1393390089).

Almost surely, 2^31428500513 is an apocalyptic number.

It is an amenable number.

31428500513 is a deficient number, since it is larger than the sum of its proper divisors (2012861623).

31428500513 is a wasteful number, since it uses less digits than its factorization.

31428500513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2773 (or 2744 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 31428500513 in words is "thirty-one billion, four hundred twenty-eight million, five hundred thousand, five hundred thirteen".