31540521345 has 64 divisors (see below), whose sum is σ = 56542593024. Its totient is φ = 14930263040.

The previous prime is 31540521343. The next prime is 31540521349. The reversal of 31540521345 is 54312504513.

It is not a de Polignac number, because 31540521345 - 2¹ = 31540521343 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31540521343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 378544 + ... + 454286.

It is an arithmetic number, because the mean of its divisors is an integer number (883478016).

Almost surely, 2^31540521345 is an apocalyptic number.

It is an amenable number.

31540521345 is a deficient number, since it is larger than the sum of its proper divisors (25002071679).

31540521345 is a wasteful number, since it uses less digits than its factorization.

31540521345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75862.

The product of its (nonzero) digits is 36000, while the sum is 33.

The spelling of 31540521345 in words is "thirty-one billion, five hundred forty million, five hundred twenty-one thousand, three hundred forty-five".