81536051 has 2 divisors, whose sum is σ = 81536052. Its totient is φ = 81536050.

The previous prime is 81536047. The next prime is 81536057. The reversal of 81536051 is 15063518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81536051 - 2² = 81536047 is a prime.

It is a super-2 number, since 2×81536051² = 13296255225349202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81536057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40768025 + 40768026.

It is an arithmetic number, because the mean of its divisors is an integer number (40768026).

Almost surely, 2^81536051 is an apocalyptic number.

81536051 is a deficient number, since it is larger than the sum of its proper divisors (1).

81536051 is an equidigital number, since it uses as much as digits as its factorization.

81536051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 81536051 is about 9029.7315020991. The cubic root of 81536051 is about 433.6272415716.

Adding to 81536051 its reverse (15063518), we get a palindrome (96599569).

The spelling of 81536051 in words is "eighty-one million, five hundred thirty-six thousand, fifty-one".