81048137 has 2 divisors, whose sum is σ = 81048138. Its totient is φ = 81048136.

The previous prime is 81048131. The next prime is 81048169. The reversal of 81048137 is 73184018.

It is an a-pointer prime, because the next prime (81048169) can be obtained adding 81048137 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80802121 + 246016 = 8989^2 + 496^2 .

It is a cyclic number.

It is not a de Polignac number, because 81048137 - 2⁶ = 81048073 is a prime.

It is a super-2 number, since 2×81048137² = 13137601022341538, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81048131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40524068 + 40524069.

It is an arithmetic number, because the mean of its divisors is an integer number (40524069).

Almost surely, 2^81048137 is an apocalyptic number.

It is an amenable number.

81048137 is a deficient number, since it is larger than the sum of its proper divisors (1).

81048137 is an equidigital number, since it uses as much as digits as its factorization.

81048137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 81048137 is about 9002.6738805757. The cubic root of 81048137 is about 432.7605646963.

The spelling of 81048137 in words is "eighty-one million, forty-eight thousand, one hundred thirty-seven".