31545540021547 has 2 divisors, whose sum is σ = 31545540021548. Its totient is φ = 31545540021546.

The previous prime is 31545540021511. The next prime is 31545540021553. The reversal of 31545540021547 is 74512004554513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31545540021547 - 2¹⁵ = 31545539988779 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31545540021497 and 31545540021506.

It is not a weakly prime, because it can be changed into another prime (31545540421547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15772770010773 + 15772770010774.

It is an arithmetic number, because the mean of its divisors is an integer number (15772770010774).

Almost surely, 2^{31545540021547} is an apocalyptic number.

31545540021547 is a deficient number, since it is larger than the sum of its proper divisors (1).

31545540021547 is an equidigital number, since it uses as much as digits as its factorization.

31545540021547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680000, while the sum is 46.

The spelling of 31545540021547 in words is "thirty-one trillion, five hundred forty-five billion, five hundred forty million, twenty-one thousand, five hundred forty-seven".