81434137 has 2 divisors, whose sum is σ = 81434138. Its totient is φ = 81434136.

The previous prime is 81434113. The next prime is 81434147. The reversal of 81434137 is 73143418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81378441 + 55696 = 9021^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 81434137 - 2²³ = 73045529 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81434099 and 81434108.

It is not a weakly prime, because it can be changed into another prime (81434107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40717068 + 40717069.

It is an arithmetic number, because the mean of its divisors is an integer number (40717069).

Almost surely, 2^81434137 is an apocalyptic number.

It is an amenable number.

81434137 is a deficient number, since it is larger than the sum of its proper divisors (1).

81434137 is an equidigital number, since it uses as much as digits as its factorization.

81434137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 81434137 is about 9024.0864911635. The cubic root of 81434137 is about 433.4464989779.

The spelling of 81434137 in words is "eighty-one million, four hundred thirty-four thousand, one hundred thirty-seven".