31545533197 has 2 divisors, whose sum is σ = 31545533198. Its totient is φ = 31545533196.

The previous prime is 31545533189. The next prime is 31545533219. The reversal of 31545533197 is 79133554513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30102597001 + 1442936196 = 173501^2 + 37986^2 .

It is a cyclic number.

It is not a de Polignac number, because 31545533197 - 2³ = 31545533189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31545533497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15772766598 + 15772766599.

It is an arithmetic number, because the mean of its divisors is an integer number (15772766599).

Almost surely, 2^31545533197 is an apocalyptic number.

It is an amenable number.

31545533197 is a deficient number, since it is larger than the sum of its proper divisors (1).

31545533197 is an equidigital number, since it uses as much as digits as its factorization.

31545533197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 850500, while the sum is 46.

The spelling of 31545533197 in words is "thirty-one billion, five hundred forty-five million, five hundred thirty-three thousand, one hundred ninety-seven".