31325400205613 has 4 divisors (see below), whose sum is σ = 31352568810588. Its totient is φ = 31298231600640.

The previous prime is 31325400205591. The next prime is 31325400205663. The reversal of 31325400205613 is 31650200452313.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25799877692164 + 5525522513449 = 5079358^2 + 2350643^2 .

It is a cyclic number.

It is not a de Polignac number, because 31325400205613 - 2¹⁰ = 31325400204589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31325400205663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13584300758 + ... + 13584303063.

It is an arithmetic number, because the mean of its divisors is an integer number (7838142202647).

Almost surely, 2^{31325400205613} is an apocalyptic number.

It is an amenable number.

31325400205613 is a deficient number, since it is larger than the sum of its proper divisors (27168604975).

31325400205613 is a wasteful number, since it uses less digits than its factorization.

31325400205613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27168604974.

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 31325400205613 its reverse (31650200452313), we get a palindrome (62975600657926).

The spelling of 31325400205613 in words is "thirty-one trillion, three hundred twenty-five billion, four hundred million, two hundred five thousand, six hundred thirteen".