31145643404385 has 32 divisors (see below), whose sum is σ = 51510725188608. Its totient is φ = 16053239957760.

The previous prime is 31145643404341. The next prime is 31145643404387. The reversal of 31145643404385 is 58340434654113.

It is not a de Polignac number, because 31145643404385 - 2⁶ = 31145643404321 is a prime.

It is a super-2 number, since 2×31145643404385² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31145643404387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45348022 + ... + 46029711.

It is an arithmetic number, because the mean of its divisors is an integer number (1609710162144).

Almost surely, 2^{31145643404385} is an apocalyptic number.

It is an amenable number.

31145643404385 is a deficient number, since it is larger than the sum of its proper divisors (20365081784223).

31145643404385 is a wasteful number, since it uses less digits than its factorization.

31145643404385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91378505.

The product of its (nonzero) digits is 8294400, while the sum is 51.

The spelling of 31145643404385 in words is "thirty-one trillion, one hundred forty-five billion, six hundred forty-three million, four hundred four thousand, three hundred eighty-five".