81238927051 has 2 divisors, whose sum is σ = 81238927052. Its totient is φ = 81238927050.

The previous prime is 81238927001. The next prime is 81238927061. The reversal of 81238927051 is 15072983218.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81238927051 - 2¹¹ = 81238925003 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81238926992 and 81238927010.

It is not a weakly prime, because it can be changed into another prime (81238927001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40619463525 + 40619463526.

It is an arithmetic number, because the mean of its divisors is an integer number (40619463526).

Almost surely, 2^81238927051 is an apocalyptic number.

81238927051 is a deficient number, since it is larger than the sum of its proper divisors (1).

81238927051 is an equidigital number, since it uses as much as digits as its factorization.

81238927051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 81238927051 in words is "eighty-one billion, two hundred thirty-eight million, nine hundred twenty-seven thousand, fifty-one".