81153931207 has 2 divisors, whose sum is σ = 81153931208. Its totient is φ = 81153931206.

The previous prime is 81153931171. The next prime is 81153931213. The reversal of 81153931207 is 70213935118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81153931207 - 2¹¹ = 81153929159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81153931207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81153931217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40576965603 + 40576965604.

It is an arithmetic number, because the mean of its divisors is an integer number (40576965604).

Almost surely, 2^81153931207 is an apocalyptic number.

81153931207 is a deficient number, since it is larger than the sum of its proper divisors (1).

81153931207 is an equidigital number, since it uses as much as digits as its factorization.

81153931207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 81153931207 in words is "eighty-one billion, one hundred fifty-three million, nine hundred thirty-one thousand, two hundred seven".