31243321340145 has 160 divisors (see below), whose sum is σ = 57563139110400. Its totient is φ = 16207428796416.

The previous prime is 31243321340137. The next prime is 31243321340177. The reversal of 31243321340145 is 54104312334213.

31243321340145 is a `hidden beast` number, since 3 + 1 + 2 + 4 + 33 + 213 + 401 + 4 + 5 = 666.

It is not a de Polignac number, because 31243321340145 - 2³ = 31243321340137 is a prime.

It is a super-2 number, since 2×31243321340145² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

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 159 ways as a sum of consecutive naturals, for example, 937404841 + ... + 937438169.

It is an arithmetic number, because the mean of its divisors is an integer number (359769619440).

Almost surely, 2^{31243321340145} is an apocalyptic number.

It is an amenable number.

31243321340145 is a deficient number, since it is larger than the sum of its proper divisors (26319817770255).

31243321340145 is a wasteful number, since it uses less digits than its factorization.

31243321340145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33861 (or 33852 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 31243321340145 its reverse (54104312334213), we get a palindrome (85347633674358).

The spelling of 31243321340145 in words is "thirty-one trillion, two hundred forty-three billion, three hundred twenty-one million, three hundred forty thousand, one hundred forty-five".