31427747140513 has 4 divisors (see below), whose sum is σ = 31427773827220. Its totient is φ = 31427720453808.

The previous prime is 31427747140507. The next prime is 31427747140519. The reversal of 31427747140513 is 31504174772413.

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

It is an interprime number because it is at equal distance from previous prime (31427747140507) and next prime (31427747140519).

It can be written as a sum of positive squares in 2 ways, for example, as 12507482974464 + 18920264166049 = 3536592^2 + 4349743^2 .

It is a cyclic number.

It is not a de Polignac number, because 31427747140513 - 2²¹ = 31427745043361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31427747140519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11491170 + ... + 13960747.

It is an arithmetic number, because the mean of its divisors is an integer number (7856943456805).

Almost surely, 2^{31427747140513} is an apocalyptic number.

It is an amenable number.

31427747140513 is a deficient number, since it is larger than the sum of its proper divisors (26686707).

31427747140513 is a wasteful number, since it uses less digits than its factorization.

31427747140513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26686706.

The product of its (nonzero) digits is 1975680, while the sum is 49.

The spelling of 31427747140513 in words is "thirty-one trillion, four hundred twenty-seven billion, seven hundred forty-seven million, one hundred forty thousand, five hundred thirteen".