81229275031 has 2 divisors, whose sum is σ = 81229275032. Its totient is φ = 81229275030.

The previous prime is 81229274953. The next prime is 81229275073. The reversal of 81229275031 is 13057292218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81229275031 - 2¹⁷ = 81229143959 is a prime.

It is a super-2 number, since 2×81229275031² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81229275131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40614637515 + 40614637516.

It is an arithmetic number, because the mean of its divisors is an integer number (40614637516).

Almost surely, 2^81229275031 is an apocalyptic number.

81229275031 is a deficient number, since it is larger than the sum of its proper divisors (1).

81229275031 is an equidigital number, since it uses as much as digits as its factorization.

81229275031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 81229275031 in words is "eighty-one billion, two hundred twenty-nine million, two hundred seventy-five thousand, thirty-one".